SPECIAL NOTICE
A -- Future Long Range Assault Aircraft Improved Propulsion Technology Demonstration
- Notice Date
- 6/16/2022 2:42:27 PM
- Notice Type
- Special Notice
- NAICS
- 541715
— Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)
- Contracting Office
- ACC-AVIATION APPLIED TECHNOLOGY DIR FORT EUSTIS VA 23604-5577 USA
- ZIP Code
- 23604-5577
- Solicitation Number
- W911W6-22-R-0007
- Response Due
- 6/30/2022 11:00:00 AM
- Point of Contact
- Nichole Taylor, Phone: 757 8791042
- E-Mail Address
-
nichole.d.taylor.civ@army.mil, laurie.pierce@us.army.mil
(nichole.d.taylor.civ@army.mil, laurie.pierce@us.army.mil)
- Description
- GENERAL INFORMATION INTRODUCTION: This Call solicits proposals for conceptual design and analysis of engine component technology to improve the capability of next generation Army rotorcraft, specifically in support of the Future Long Range Assault Aircraft (FLRAA).� FLRAA is the next generation of affordable vertical lift utility aircraft for the Army. The Army is conducting a competition limited to Bell Textron Inc. and Sikorsky Aircraft Company in support of its FLRAA development efforts under solicitation number W58RGZ-21-R-0084. FLRAA�s primary mission is long range assault and air movement of personnel and equipment.� FLRAA expands the depth of the battlefield � strategic support area to the deep maneuver area � extending reach from relative sanctuary and reducing enemy reaction time and freedom of action. FLRAA capabilities provide enhanced maneuverability and agility, increased reach (speed, range, payload, hover capability, and self-deployment) significantly beyond any current rotorcraft, improved sustainability (reliability, availability, and maintainability), and enhanced survivability. � A robust, lightweight, high performance propulsion system is necessary to meet these demanding mission performance objectives.� Therefore, significant advancements in engine system technologies that improve performance (horsepower/weight (HP/Wt), specific fuel consumption (SFC)) and life cycle cost (durability, reliability, sustainability) are envisioned to affordably provide the characteristics needed for FLRAA and other Future Vertical Lift (FVL) platforms. The project will include the following activities: definition of the Baseline engine design, the planned Future engine design, development of Enhanced engine design, and noting science and technology required developments to address capability gaps. Activities also include conceptual design, trade-off/benefit analysis and reporting to recommend the highest value turbine engine system technologies for further development that provide increased performance, durability, maintainability, weight, cost, or other capability / affordability benefits for the FLRAA future engine(s) as well as for other FVL platforms and enduring fleet aircraft. The Government proposes use of an indefinite delivery, indefinite quantity (IDIQ) type contract with a scope that includes both the work described in the preceding paragraph as well as future potential unfunded studies to include aircraft integration studies, sustainability studies, and/or an assessment of the engine offerings ability to meet modular open systems approach (MOSA) requirements and identification of related risks.� Offerors must include as part of the proposal evidence that the company is a main engine supplier to one of the companies competing for FLRAA under solicitation W58RGZ-21-R-0084 in order for a vendor to qualify for this announcement opportunity.� Clear documentation of the direct support would be in the form of a letter from airframe platform vendor to document engine supplier relationship.� In the event of an Army announcement of selection of the Offeror for the FLRAA design, development, test and production, the Call may result in a single award to the engine supplier who is selected.�� 2.0 RESEARCH OPPORTUNITY DESCRIPTION:� Call W911W6-22-R-0007 solicits proposals for multiple studies to perform conceptual design and analysis to identify recommended design improvements of FLRAA engine offerings, under the Engines & Drive Trains Research Opportunity of the Master BAA W911W6-21-R-0013 which is posted to System for Award Management (SAM) at https://www.sam.gov. TECHNICAL DESCRIPTION: Work shall be accomplished in three phases. Phase I: Proposed effort under Phase I shall consist of definition of the Baseline engine design, the Future engine design, and noting key differences between the two systems.� Phase II: Proposed effort under Phase II shall consist of conceptual design of an Enhanced engine that provides increased performance, reliability/durability, maintainability, weight, cost, or other capability / affordability benefits for the FLRAA engine(s) under consideration, as identified in Phase I.� The Offeror shall provide conceptual design of proposed technologies which align and support the FLRAA capability metrics by providing a specific capability enhancement.� The Offeror shall document the turbine engine system technologies that provide improved capabilities within the Enhanced engine. Phase III: Proposed effort under Phase III shall consist of trade-off/benefit analysis and reporting to recommend the highest value turbine engine system technologies for further development that provide increased performance, reliability/durability, maintainability, weight, cost, or other capability / affordability benefits for the FLRAA engine(s) under consideration, as identified in Phases I and II.� The Offeror shall perform trade-off analyses of system and subsystem design considerations as well as platform level analyses.� The Offeror shall prioritize their recommended turbine engine system technologies based on FLRAA platform benefits and identify projected funding requirements as well as the timeline for their proposed technology development efforts, to include demonstration of the technology to a TRL6. The Offeror shall also provide details on how these enhancements would also be applicable to H-47 applications, or if any changes would be necessary to be applicable to both platforms.� The following design characteristics shall be taken into consideration when completing the conceptual design assessment of engine component/system technologies. FLRAA IPTD trade study program characteristics and associated notes/ground rules include the following: Desired Characteristics (for engine technology assessment(s)): Specific Fuel Consumption (SFC) Across the Envelope:� Consider technologies that address reduction of SFC across a wide range of operating conditions.� This includes consideration of conditions that encompass operation in high hot, high cold hover and cruise conditions. Horsepower to Weight Ratio (HP/Wt):� Consider the implications of weight for given technologies and how they impact the overall HP/Wt ratio of the propulsion system.� This involves consideration of technologies that can provide high performance with reduced weight.� Consider federated versus integrated technology solutions to determine what benefit a proposed technology has to enabling a higher HP/Wt ratio. Adaptability:� This is defined as the propulsion system�s ability to effectively respond to changing ambient conditions to enable high performance and/or improved durability across the envelope.� This would include (but not be limited to) design aspects such as intelligent components (ability to turn on/off systems as needed) and variable components (ability to actively or passively manage performance per environmental conditions). Survivability:� Work in this category focuses on technology or design features which enable the engine to operate more effectively in contested environments, as well as continue operations after a damaging event, and/or safely shut down in the event of imminent catastrophic failure. Thermal and acoustic signatures of the propulsion system fall within this category. Additionally, ballistic tolerance which covers direct damage from projectiles, operation under oil out contingencies, and safe shutdown of the engine from overmatched impactors. Also included is Cybersecurity and Electronic Warfare resistance of the propulsion system and its components. These do not preclude any other survivability concerns which may be identified in the future. Durability:� This is defined as the ability of the propulsion system to sustain high levels of performance in adverse operating conditions for the entire design life spectrum.� Consider technologies that enable the engine to maintain performance in conditions that vary from hot, sandy environments to cold environments.� This will include consideration of sand tolerance technologies, ruggedized component technologies, and technologies that add to the operational life of the propulsion system. Sustainability:� This is defined as the ability of the propulsion system to maintain high performance over a prolonged operational period without requiring maintenance.� Consider technologies that enhance the maintenance free period of operation of the propulsion system as well as improved maintainability. Lifecycle Cost:� Consider how the design of the proposed technologies will impact the overall lifecycle costs associated with propulsion systems.� This will include consideration of maintenance cost and production cost. Additionally, for each component technology analyzed in the trade study, the Offeror should follow typical lifing requirements, and the Offeror should define within their proposal what lifing standards are used in the trade study. ANTICIPATED AWARD DATE AND GOVERNMENT FUNDING LEVELS: ANTICIPATED AWARD DATE: Target date for Contract Award is 15 August 2022. �� ANTICIPATED FUNDING FOR PROGRAM:� Available Government funding for initial task orders is up to $2.625M.� Government fiscal year distribution is as follows: �FY22$ 1.150M and FY23 $1.475M. Phase I will be on the order of $100K. Phase II will be on the order of $0.475M.� Phase III will be on the order of $1.475M. TYPE OF CONTRACT/INSTRUMENT:� The Government intends to award an Indefinite Delivery Indefinite Quantity (IDIQ) FAR Part 16 type contract due to the currently undefined nature of further work or efforts beyond the initial task order.� Minimum contract value will be $100K and will be satisfied with award of the first Task Order. Maximum contract value will be $4.5M.� NUMBER OF AWARDS ANTICIPATED:� Any award made from this call will be subject to availability of funds.� The Government�s objective under this Call is to procure development of advanced engine technologies by the supplier of the FLRAA aircraft engines.� The Government intends to make up to two awards from this Call but depending upon information known at time of award may make only one award. The number of award(s) made under this Call will depend upon when the Government announces the successful Offeror under solicitation W58RGZ-21-R-0084.� If the Government does not make an announcement of a FLRAA award under W58RGZ-21-R-0084 in FY22, the Government intends to make two awards to those engine developers that can demonstrate access to aircraft design data for the two FLRAA competitors.� ANTICIPATED PERIOD OF PERFORMANCE: The IDIQ contract period of performance will be sixty (60) months. Phase I period of performance will be approximately three (3) months beginning in FY22. Phase II period of performance will be approximately six (6) months beginning in FY22.� Phase III period of performance will be approximately 18 months beginning in FY23.� DELIVERABLES: Each Task Order will define the required deliverables with contract data requirements list (CDRLs) as required.� Each will require (1) Work Plan, (2) Progress, Status, & Management Report, (3) Final Report, and (4) Briefing Charts. APPLICATION AND SUBMISSION INFORMATION: This Call will use the full proposal submission process as described in Section 5.2 of the Master BAA and as further supplemented below: PROPOSAL SUBMISSION:� Proposals are due June 20, 2022 not later than 2:00 p.m. EDT.� Proposals shall be marked with the solicitation number and shall be submitted to Army Contracting Command � Redstone Arsenal Attn:� CCAM-MZD-B, 401 Lee Boulevard, Fort Eustis, VA� 23604-5577.� Unclassified technical and cost proposals should be submitted electronically to the DoD Safe Access File Exchange at https://safe.apps.mil.� Send an email to drop off request to �nichole.d.taylor.civ@army.mil and laurie.a.pierce2.civ@army.mil with the subject: �Drop-off request Call W911W6-22-R-0007, at least 3 business days prior to the due date and a link to the DoD SAFE site will be provided.� This announcement is an expression of interest only and does not commit the Government to pay any proposal preparation costs. All questions must be submitted in writing and emailed to the Contract Specialist at nichole.d.taylor.civ@army.mil and laurie.a.pierce2.civ@army.mil.� Questions shall be submitted within 10 days prior to the Call closing date to ensure a response. All questions and responses received will be posted to https://beta.sam.gov as an amendment to the Call.� Proposals received after the date and time specified for closing will be handled in accordance with FAR 52.215-1, Instructions to Offerors � Competitive Acquisition. PAGE LIMITATIONS:� The technical proposal shall be limited to 30 pages, exclusive of title page, section dividers, table of contents, list of figures/tables, glossary of terms, key personnel bios, and cross-referencing indices.� Submission shall be limited to the number of pages specified, total inclusive of any drawings, charts, etc.� Fold-out illustrations required for reader ease are allowed, however, illustration shall be counted in 8 �� x 11� increments (e.g., an 11� x 17� document will count as two pages). VOLUME I - TECHNICAL PROPOSAL:� The technical volume of the proposal shall address all of the requirements discussed in Paragraph 2.0: Technical Description, of this Call. The technical proposal shall clearly address the Offeror�s plan to perform the scope of the below SOW efforts. PHASE I: PHASED PROPULSION STRATEGY DEFINITION 1.0 SCOPE Proposed effort under Phase I shall consist of definition of the Baseline engine design, the Future engine design, and noting key differences between the two systems.� The overall program management plan (work plan) shall be documented at the beginning of the effort (CDRL A001). 2.0 TASKS 2.1 BASELINE DESIGN� The Offeror shall define the Baseline engine/ propulsion system they are using for the baseline FLRAA platform and define their current strategy for a Future engine / propulsion system that provides improvements to the Baseline system for future FLRAA platform configurations. The differences in the systems shall be documented along with expected capability / performance improvements expected from these differences.� Any expected gaps in performance for future FLRAA platform configurations based on projected FLRAA program metrics shall also be documented.� Results of the work shall be presented via final review briefing charts (CDRL A003) and clearly documented in the final report (CDRL A002). 2.1.1 Baseline Propulsion System Definition The Offeror shall clearly identify their baseline engine / propulsion system for the baseline FLRAA platform.� The Baseline system shall be the system currently proposed the baseline FLRAA platform configuration. This engine will be referred to as the baseline engine. 2.1.2 Future Propulsion System Concept Definition The Offeror shall define their planned engine / propulsion system concept or the growth plan for the current Baseline engine for future FLRAA platform configurations. This engine will be referred to as the Future engine. The Offeror shall document the improvement over the Baseline engine system, and show how the Future planned engine system is intended to meet projected FLRAA capability metrics.� The Future planned engine system concept shall include system level performance cycle definition, and shall define the key system performance metrics and capability improvements.� Metrics and design parameters should at minimum include: specific fuel consumption, weight, power, materials, design life, reliability/durability, affordability, and maintainability impacts.� 2.1.3 Key Differences The Offeror shall clearly identify the technological differences between the Baseline and Future engine systems.� Differences shall be succinctly documented in summary, in the Final Report (CDRL A002). 3.0 DELIVERABLES AND PROGRAM MANAGEMENT The Offeror shall perform proposal, business, technical management, reporting, and Task Order closeout activities as necessary. 3.1 Deliverables The Offeror shall prepare and deliver the following data items in accordance with the Contract Data Requirements List (CDRL) DD Forms 1423, Exhibit A of the Master contract. 3.1.1 A001 - Work Plan 3.1.2 A002 - Final Report 3.1.3 A003 - Briefing Charts 3.2 Kick-off Meeting The Offeror shall conduct a kick-off meeting with the Government via teleconference within thirty (30) days of Task Order award to review the technical approach. 3.3 Final Briefing The Offeror shall conduct a final briefing at the Technology Development Directorate at Ft. Eustis, VA within thirty (30) days completion of all technical effort under this Task Order. PHASE II: CONCEPTUAL DESIGN OF ENHANCED PROPULSION SYSTEM 1.0 SCOPE Proposed effort under Phase II shall consist of conceptual design of an Enhanced engine that provides increased performance, reliability/durability, maintainability, weight, cost, or other capability / affordability benefits for the FLRAA Future engine under consideration, as identified in Phase I.� The Offeror shall provide conceptual design of proposed technologies which align and support the FLRAA capability metrics by providing a specific capability enhancement.� The Offeror shall document the turbine engine system technologies that provide improved capabilities to the Future planned engine system. The overall program management plan (work plan) for Phase II shall be documented at the beginning of the effort (CDRL A001). 2.0 TASKS 2.1 TRADE-OFF/ BENEFIT ANALYSIS The Offeror shall perform system conceptual design of engine technologies that offer improvements over their planned Future engine system.� This engine will be referred to as the Enhanced engine.� Progress results of the system conceptual design shall be presented on a bi-monthly basis via review briefing charts (CDRL A004) and documented within quarterly progress, status, and management report (CDRL A002). 2.1.1 Conceptual Design The Offeror shall complete a conceptual design of an Enhanced engine with technologies and / or approaches to provide increased performance, durability, maintenance, weight, cost, or other capability / affordability benefits over the prior planned Future engine system under consideration.� The Offeror shall provide conceptual design of proposed technologies, which align and support the FLRAA capability metrics by providing a specific capability enhancement.� The Enhanced propulsion system concept shall include system level performance cycle definition, and shall define the key system performance metrics and capability improvements.� Metrics and design parameters shall at minimum include: specific fuel consumption, weight, power, materials, design life, reliability/durability, affordability, and maintainability impacts.� This engine will be referred to as the Enhanced engine.� A complete summary of the conceptual design shall be documented in the Final Report (CDRL A003). 2.1.2 Analysis Techniques The Offeror shall clearly identify the methodologies and analysis techniques used to determine key technology improvements.� This task shall include the definition of the tools, models, and criteria used to evaluate each system and subsystem within the Enhanced engine. 2.2 KEY TECHNOLOGIES The Offeror shall provide a summary of the key technologies included in the Enhanced engine conceptual design, over the planned Future engine system.� This summary shall succinctly summarize the benefits of each technology to the Enhanced engine conceptual design and the capability trade-off considerations that would require further exploration for each technology. This shall be documented in the Final Report (CDRL A003). 3.0 DELIVERABLES AND PROGRAM MANAGEMENT The Offeror shall perform proposal, business, technical management, reporting, and Task Order closeout activities as necessary. 3.1 Deliverables The Offeror shall prepare and deliver the following data items in accordance with the Contract Data Requirements List (CDRL) DD Forms 1423, Exhibit A of the Master contract. 3.1.1 A001 - Work Plan 3.1.2 A002 - Progress, Status, & Management Report 3.1.3 A003 - Final Report 3.1.4 A004 - Briefing Charts 3.2 Kick-off Meeting The Offeror shall conduct a kick-off meeting with the Government via teleconference within thirty (30) days of Task Order award to review the technical approach. 3.3 Final Briefing The Offeror shall conduct a final briefing at the Technology Development Directorate at Ft. Eustis, VA within thirty (30) days of completion of all technical effort under this Task Order. PHASE III: DETAILED ANALYSIS OF PROPULSION TECHNOLOGY OPPORTUNITIES 1.0 SCOPE Proposed effort under Phase III shall consist of trade-off/benefit analysis and reporting to recommend the highest value turbine engine system technologies for further development that provide increased performance, reliability/durability, maintainability, weight, cost, or other capability / affordability benefits to the Future FLRAA engine, as identified in the Phases I and II.� The Offeror shall perform trade-off analyses of system and subsystem design considerations as well as platform level analyses.� The Offeror shall prioritize their recommended turbine engine system technologies based on FLRAA platform benefits and identify projected funding requirements as well as the timeline for their proposed technology development efforts, to include demonstration of the technology to a TRL6. The Offeror shall also provide details on how these enhancements would also be applicable to H-47 applications, or if any changes would be necessary to be applicable to both platforms.� The overall program management plan (work plan) for Phase III shall be documented at the beginning of the effort (CDRL A001). 2.0 TASKS 2.1 TRADE-OFF/ BENEFIT ANALYSIS The Offeror shall perform system and subsystem level trade-off / benefit analysis of technologies within the defined Enhanced engine from Phase II to identify key technologies or approaches that could provide a performance benefit or capability enhancement over the currently defined Future configuration engine. The individual benefit(s) of each technology / approach shall be documented to show the improvement over the currently planned Future configuration engine.� Progress results of the trade-off/ benefit analysis shall be presented on a bi-monthly basis via review briefing charts (CDRL A004) and documented within quarterly progress, status, and management report (CDRL A002).� A complete summary of the trade analyses listed below shall be documented in the Final Report (CDRL A003). 2.1.1 Subsystem Level Analysis The Offeror shall perform detailed analysis of specific key component technologies and/or approaches that provide system level cycle or capability improvements to the overall Enhanced engine system to provide benefit to the FLRAA program via incremental upgrades.� Key technologies and/or approaches identified at the subsystem level shall minimally consider: component efficiency, temperatures, pressures, mass flows, and overarching cycle metrics that impact individual component performance as well as weight, power, durability, reliability, maintainability, sustainment, or other capability that offers potential improvement for the FLRAA platform. Subsystem level or component level improvements shall be clearly identified and substantiated by analysis. 2.1.2 System Level Analysis The Offeror shall analyze the Enhanced engine performance cycle to clearly identify system level technology improvements that can be made to provide benefit to FLRAA program via incremental upgrades.� Key technologies identified at the system level shall minimally consider specific fuel consumption, horsepower to weight ratio, adaptability, durability, sustainability, reliability, maintainability, life, and lifecycle cost.� Subsystem technology contributions to system level improvements shall be individually and clearly identified and substantiated by analysis. 2.1.3 Platform Level Analysis � FLRAA The Offeror shall perform FLRAA platform level mission analyses including the Enhanced engine to clearly identify mission improvements enabled by the identified improved system.� Platform level benefits analysis shall minimally assess: speed, payload/range, hover capability, reliability, availability, maintainability, survivability, and maneuverability.� Subsystem and system technology contributions to platform metrics shall be clearly identified and substantiated by analysis. 2.1.4 Platform Level Analysis � H-47 The Offeror shall perform H-47 platform level mission analysis including the Enhanced engine to clearly identify mission improvements enabled by the identified improved system.� Platform level benefits analysis shall minimally assess: speed, payload/range, hover capability, reliability, availability, maintainability, survivability, and maneuverability.� Subsystem and system technology contributions to platform metrics shall be clearly identified and substantiated by analysis. 2.2 KEY TECHNOLOGY MATURATION PLANS The Offeror shall develop technology maturation plans that provide optimal performance benefits to meet or exceed future FLRAA platform configuration metrics.� The Offeror shall also detail how the proposed key technologies to be matured would apply to and benefit H-47 applications.� The key technology maturation plans developed under this task shall be part of the final report (CDRL A003). 2.2.1 Key Technologies The Offeror shall clearly document the key technologies that bring the optimal benefit to the future FLRAA platform configuration metrics.� Each key technology identified shall be derived from trade-off / benefits analysis and shown to provide subsystem and/or system level performance benefits.� Each key technology shall clearly identify the performance / capability benefits, key challenges to address, and metrics to evaluate for each key technology�s development.� It is expected that the required development effort would entail demonstration at the component level as well as incorporating the component technology within the engine for TRL/IRL 6 demonstration.� The Offeror shall clearly identify facility, technical data, or other technical resources required to enable a TRL/IRL 6 demonstration and whether the Offeror has access to these resources or would need to acquire access. 2.2.2 Key Technology Development Funding Required The Offeror shall identify funding requirements for development/demonstration up to TRL6/IRL6, for each key technology identified.� Funding requirements shall include detailed breakdown of estimated labor hours, materials, and other costs to support the proposed maturation plan.� In addition, the Offeror shall provide a preliminary detailed estimate of the funding required to qualify the technology to allow for incorporation onto the FLRAA platform. 2.2.3 Key Technology Development Timeline Required The Offeror shall identify the timelines required to mature each identified key technology.� The proposed maturation timelines for the technologies shall focus on development to TRL/IRL 6 and clearly identify potential technology infusion opportunity points within the FLRAA platform development schedule. 2.2.4 Key Technology Development Prioritization The Offeror shall provide a prioritized list of key technology maturation plans based on FLRAA platform benefits.� The prioritized list shall consider the funding and timeline required to mature each key technology as part of the prioritization.� 2.2.5 Key Technology Applicability to H-47 Platform The Offeror shall provide details on how each key technology would also be applicable to H-47 application.� This task shall identify the expected benefit to be derived from application to the H-47 platform.� Additionally, the Offeror shall identify if there would be any changes or differences necessary for each key technology to benefit both the FLRAA and H-47 platforms.� 3.0 DELIVERABLES AND PROGRAM MANAGEMENT The Offeror shall perform proposal, business, technical management, reporting, and Task Order closeout activities as necessary. 3.1 Deliverables The Offeror shall prepare and deliver the following data items in accordance with the Contract Data Requirements List (CDRL) DD Forms 1423, Exhibit A of the Master contract. 3.1.1 A001 - Work Plan 3.1.2 A002 - Progress, Status, & Management Report 3.1.3 A003 - Final Report 3.1.4 A004 - Briefing Charts 3.2 Kick-off Meeting The Offeror shall conduct a kick-off meeting with the Government via teleconference within thirty (30) days of Task Order award to review the technical approach. 3.3 Final Briefing The Offeror shall conduct a final briefing at the Technology Development Directorate at Ft. Eustis, VA within thirty (30) days of completion of all technical effort under this Task Order. DATA RIGHTS:� Offerors shall identify the technical data or computer software that they assert would be furnished with restrictions on the Government�s use, release or disclosure if an award is made under this announcement.� This information shall be provided with the proposal using the format/table included in DFARS 252.227-7017 Identification and Assertion of Use, Release or Disclosure Restrictions. VOLUME II - COST PROPOSAL:� Refer to the Master BAA for Cost Proposal requirements.� Offerors are requested to price each phase of the SOW detailed in Section 4 above as a separately priced option. If a foreign entity is participating as part of a prime's team, the cost volume shall clearly identify such participant and the Offeror's planned compliance with U.S. export controls, including any required export licensing.
- Web Link
-
SAM.gov Permalink
(https://sam.gov/opp/6a162e0eb11b4c07be741c95c91d4183/view)
- Place of Performance
- Address: Fort Eustis, VA 23604, USA
- Zip Code: 23604
- Country: USA
- Zip Code: 23604
- Record
- SN06360393-F 20220618/220616230113 (samdaily.us)
- Source
-
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