REVIEW 4 major objections 5 minor 39 references
A User-centric Game for Balancing V2G Benefits with Battery Degradation of Electric Vehicles
T0 review · 4 major / 5 minor · reviewed 2026-08-15 · deepseek-v4-flash
Pith's one-line read A two-player game lets EV owners dial in their V2G-versus-battery-wear trade-off.
desk verdict A clean, incremental V2G trade-off paper whose horizon-splitting game is a genuinely usable idea; the offline battery temperature shortcut is the one real soft spot. read the letter →
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
What carries the argument
The load-bearing object is the exact potential function $P(u) := \sum_{j\in T^w_m} \alpha_j P_{\mathrm{bat},j}\Delta t + \gamma \sum_{j\in \tilde T^w_m} Q^{\mathrm{cyc}}_{\mathrm{loss},j}(P_{\mathrm{bat},j})$ from Proposition 1. It makes the two players' selfish improvements point in the same direction as a single common objective, so the game's generalized Nash equilibria coincide with the minimizers of one convex program, (12). Supporting this, the paper replaces the non-smooth exponential cyclic-aging term of the empirical model with the smooth, power-quadratic approximation in (3), which keeps $P$ convex and cheap to solve while binding the degradation cost to the actual charging power.
What would settle it
Simulate the optimized schedule from (12) with the full coupled cabin–battery temperature equations, recompute the cyclic capacity loss with the resulting $T_b$, and compare it with the loss using the paper's precomputed temperature profile; if the difference is large enough to change the ordering of the trade-off curves in the paper's case studies, the central trade-off claim fails.
Extended reading notes
Core claim
The paper's central claim is that a user-centric V2G charging schedule can be computed as the equilibrium of a two-player game, not as a scalarized optimization over both objectives. Player V2G minimizes charging cost on a chosen set of time slots; player BD minimizes cyclic battery-capacity loss on the remaining slots. Proposition 1 shows the game is an exact generalized potential game, with potential function P(u) given in (11), so any global solution of the convex program (12) is a generalized Nash equilibrium. The horizon-splitting rule, assigning the w highest-price intervals to the V2G player and the rest to the degradation player, gives the user a single integer control over the trade-off, and constraint (8) ensures the final energy target is always met within tolerance.
Load-bearing premise
The scheme assumes the battery's temperature can be fixed in advance from a representative charging current rather than recomputed from the actual optimized schedule; if the real temperature under that schedule is materially different, the degradation costs and the trade-off curves shift.
Editorial extensions
If this is right
- An EV owner can choose any degree of V2G participation by setting a single integer $w$, and the resulting schedule still meets the user's desired final energy within tolerance.
- Because the equilibrium is computed by a convex program, each 48-interval, 12-hour schedule solves in under 50 ms on a laptop-class processor, which the paper argues makes real-time embedded implementation feasible.
- The reported sensitivity and regret comparisons imply that the game-theoretic schedule inherits robustness to uncertainty in the degradation parameters $B_1,B_2$ without needing an additional robustification layer.
- The trade-off studies give concrete guidance: colder ambient temperatures and smaller battery capacities make aggressive V2G participation costlier in battery health, while high tariff volatility and higher-rated chargers make participation more financially attractive.
Reading between the lines
- If the offline-temperature assumption is nearly exact, the same exact-potential construction should extend to any convex, power-dependent battery wear model, because convexity is the only property the proof of Proposition 1 uses beyond compactness.
- A direct test of the robustness claim would be to feed the optimized schedule back into the full coupled temperature dynamics and recompute degradation; until that loop is closed, the numerical robustness results are conditional on the precomputed temperature profile.
- The horizon-splitting mechanism is a template for any two-sided scheduling problem with a monetary and a wear objective, and the price-sorting rule could be adapted to other signals such as carbon intensity or grid congestion.
Signed reviews
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper proposes a user-centric smart charging framework for vehicle-to-grid (V2G) services, formulated as a two-player generalized Nash game. One player maximizes V2G revenue, the other minimizes cyclic battery degradation, and the user selects a hyperparameter w that allocates time intervals between the two players. The authors show that the game is an exact potential game (Proposition 1), so a generalized Nash equilibrium can be obtained by solving the convex program (12). They compare this approach with a multi-objective formulation and an MPC baseline using sensitivity and regret metrics, and they present trade-off studies with respect to ambient temperature, tariff volatility, charger rating, battery capacity, and a one-year projection. The central claims are that the game-theoretic formulation is more robust to degradation-parameter uncertainty and that the parameter w gives EV users a practical, interpretable knob for balancing financial benefit against battery health.
Significance. If the technical issues are resolved, this is a useful contribution to user-centric V2G scheduling. The game-theoretic modeling of the trade-off is novel, the exact-potential characterization in Proposition 1 and Appendix B is sound, and reducing the equilibrium computation to the convex problem (12) is a genuine computational advantage. The paper also provides a broad numerical study that addresses practically relevant factors such as ambient temperature, charger rating, and battery capacity, which is valuable for guiding user decisions. However, the numerical results rest on several modeling approximations and parameter conventions that are not yet fully validated, and the headline robustness claim is partly built into the formulation. The paper would be suitable for publication after these issues are addressed and the numerical implementation is verified.
major comments (4)
- [Section II.B, Eq. (4), and Section III.B] The battery temperature used in the degradation coefficients is computed offline from a representative current Î = ρ(Pmax/Vbat), but the promised elaboration of ρ in Section III.B never appears; Section III.B defines w and m and does not mention ρ, and Section III.C later reuses ρ as a multi-objective weight in (13). Because B1,t and B2,t in (3) are fixed from this offline Tb profile, the optimized schedule Pbat,t does not feed back into the degradation cost. A high-w solution assigns more high-price intervals to the V2G player and therefore increases the average |Pbat,t| and the heat term Q = I²Rint; fixing Tb from a single ρ will under-estimate degradation for large w and over-estimate it for small w, systematically biasing the trade-off curves in Figs. 4-7 and the one-year projection in Fig. 9. Please couple Tb to the decision variables, or provide a concrete test showing that the degradation results are insensitive to the schedule used for the offline computation, and state explicitly how ρ relates to w.
- [Section IV.B, Eqs. (14)-(16), Fig. 3] The headline robustness result is partly built into the game formulation. In the perturbed potential P~(u,ζ), the uncertainty ζ is assumed to affect only the degradation term Qcyc, which appears in P only on the intervals assigned to the BD player; the V2G player's objective terms in (11) have no ζ dependence. Consequently, the V2G player's decision variables are ζ-invariant by construction, so the sensitivity Sgt and regret Rgt in (15)-(16) are mechanically bounded. This does not invalidate the comparison with the multi-objective formulation (13), but the claim that the game is 'significantly more robust' should be qualified as a property of the hard time-slot partition rather than an empirical discovery. To make the comparison informative, the authors should also perturb quantities that affect both approaches symmetrically, such as the price coefficients αt or all degradation coefficients over the entire horizon.
- [Section II.A, Table I, and Section IV.A] There is a serious parameter/unit inconsistency in the degradation model. With Tb in kelvin as stated, the Table I constants give B1(298 K) = 8.61e-6·298² - 5.13e-3·298 + 0.763 ≈ -0.0011, so the cyclic capacity loss in (3) would be negative at typical operating temperatures, and the quadratic term in P would be concave rather than convex, contradicting the convexity argument used for (12). This is only physically meaningful if the temperature in (2b)-(2c) is in Celsius as in the original reference [16]; please correct the unit statement and re-verify all numerical results. Relatedly, Eq. (3) and Appendix A define Vbat as the terminal voltage of a single cell, while Section IV.A states that the terminal voltage of the battery pack is 350 V; using the pack voltage in (3) changes the computed C-rate by a factor of approximately nseries and would alter the degradation magnitudes in Figs. 4-9. Please confirm which convention was actually used in the code.
- [Section II.A, Eq. (3), Appendix A] The smooth approximation exp(α|x|) ≈ 1 + α²x²/h with h = 0.0465 is used without an accuracy assessment. The paper does not report the approximation error over the C-rates and temperatures actually encountered in the case studies, e.g., Pbat up to 22 kW with the pack parameters in Section IV.A. Since all degradation costs and resulting trade-off curves are computed with (3), a quantitative validation of the approximation error over the operating envelope should be provided.
minor comments (5)
- [Notation (Sections II.B and III.C)] The symbol ρ denotes a user participation level in the temperature model in Section II.B and a convex-combination weight in (13); using the same symbol for two different quantities is confusing even if the promised elaboration were provided.
- [Appendix B] In the second half of the proof of Proposition 1, 'given x2,y2∈Ω1(u−2)' should read 'x2,y2∈Ω2(u−2)'.
- [Section III.C] The perturbation support set is written inconsistently as '[a,a]' and '[a,a]'; likely ̲a and ̄a are intended.
- [Section IV.E] The one-year projection does not state whether the coefficients B1,t/B2,t and the battery capacity are updated as degradation accumulates; if they are kept constant, that approximation should be stated explicitly and ideally justified.
- [Section IV.B, Fig. 3] The text should clarify how the discrete sweep over w for the game-theoretic method is aligned with the continuous sweep over ρ for the multi-objective method so that the sensitivity and regret box plots are directly comparable.
Circularity Check
No significant circularity: the game, potential function, and robustness metrics are derived from external models and explicit constructions, not from their own conclusions.
full rationale
The derivation chain is self-contained rather than circular. The degradation model (2)-(3) is imported from the external empirical work [16] and smoothed in Appendix A; the temperature dynamics (4) come from [11]/[22]. The game in (9)-(10) is explicitly defined, and Proposition 1 proves the exact-potential property by a direct algebraic check in Appendix B; the potential function is constructed as the sum of the players' objectives, so the GNE equivalence in (12) is a standard potential-game result rather than a conclusion that re-imports its own premise. The robustness comparison in Section III.C uses conventional sensitivity (15) and regret (16) metrics evaluated against the same objectives that each method minimizes; the lower sensitivity of the game solution is a structural property of the horizon split, not a fitted parameter relabelled as a prediction. The paper's self-citation [21] is a remark about an alternative degradation model and is not load-bearing. The Section II.B treatment of T_b as a precomputed parameter, the unresolved rho/w relationship, and the acknowledged need for an adaptive temperature mechanism are modeling limitations and internal inconsistencies, but none of them makes a derived quantity equal to an input by construction.
Assumptions & free parameters
free parameters (3)
- h =
0.0465
- gamma (battery degradation cost weight) =
585 e/kWhr
- rho (temperature participation level) =
not specified
assumptions (5)
- domain assumption The empirical calendar and cyclic aging model of [16] (Eqs. (1)-(2)) accurately describes capacity loss for the battery pack.
- ad hoc to paper Thermal simplifications in Section II.B: qrad = 0, qhvac = 0, and qbtms = -0.9Q.
- ad hoc to paper The battery temperature Tb can be approximated by an offline profile computed with a representative current, independent of the optimized power schedule.
- ad hoc to paper The smooth approximation exp(α|x|) ≈ 1 + α²x²/h with h = 0.0465 is accurate over the operating C-rate range.
- domain assumption The V2G tariff profile from Fig. 7 of [27] is representative of dynamic grid-service prices.
Cite this review
Pith. "Pith review of A User-centric Game for Balancing V2G Benefits with Battery Degradation of Electric Vehicles." pith.science (2026). https://pith.science/paper/E4WUHTSI
@misc{pith2026250511027,
author = {Pith},
title = {Pith review of: A User-centric Game for Balancing V2G Benefits with Battery Degradation of Electric Vehicles},
year = {2026},
howpublished = {\url{https://pith.science/paper/E4WUHTSI}},
note = {Machine review of arXiv:2505.11027}
}
read the original abstract
We present a novel user-centric vehicle-to-grid (V2G) framework that enables electric vehicle (EV) users to balance the trade-off between financial benefits from V2G and battery health degradation based on individual preference signals.
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Figures from the paper (8 more)
Reference graph
Works this paper leans on
-
[16]
J. Wang, J. Purewal, P. Liu, J. Hicks-Garner, S. Soukazian, E. Sherman, A. Sorenson, L. Vu, H. Tataria, and M. W. Verbrugge, “Degradation of lithium ion batteries employing graphite negatives and nickel–cobalt– manganese oxide+ spinel manganese oxide positives: Part 1, aging mechanisms and life estimation,” Journal of Power Sources , vol. 269, pp. 937–948, 2014
work page 2014
-
[1]
Re-examining rates of lithium-ion battery technology improvement and cost decline,
M. S. Ziegler and J. E. Trancik, “Re-examining rates of lithium-ion battery technology improvement and cost decline,” Energy & Environ- mental Science, vol. 14, no. 4, pp. 1635–1651, 2021
work page 2021
-
[2]
The role of critical minerals in clean energy transitions,
IEA, “The role of critical minerals in clean energy transitions,” Online available in: ‘https://www.iea.org/reports/ the-role-of-critical-minerals-in-clean-energy-transitions’, 2022, accessed: 16/08/2024
work page 2022
-
[3]
Opportunities and challenges of vehicle-to-home, vehicle-to-vehicle, and vehicle-to-grid technologies,
C. Liu, K. Chau, D. Wu, and S. Gao, “Opportunities and challenges of vehicle-to-home, vehicle-to-vehicle, and vehicle-to-grid technologies,” Proceedings of the IEEE , vol. 101, no. 11, pp. 2409–2427, 2013
2013
-
[4]
F. Aguilar Lopez, D. Lauinger, F. Vuille, and D. B. M ¨uller, “On the potential of vehicle-to-grid and second-life batteries to provide energy and material security,” Nature Communications, vol. 15, no. 1, p. 4179, 2024
work page 2024
-
[5]
Electric vehicle batteries alone could satisfy short-term grid storage demand by as early as 2030,
C. Xu, P. Behrens, P. Gasper, K. Smith, M. Hu, A. Tukker, and B. Steubing, “Electric vehicle batteries alone could satisfy short-term grid storage demand by as early as 2030,” Nature Communications , vol. 14, no. 1, p. 119, 2023
work page 2023
-
[6]
Electric vehicles as a new power source for electric utilities,
W. Kempton and S. E. Letendre, “Electric vehicles as a new power source for electric utilities,” Transportation Research Part D: Transport and Environment, vol. 2, no. 3, pp. 157–175, 1997
work page 1997
-
[7]
A. N. Brooks et al., “Vehicle-to-grid demonstration project: Grid regu- lation ancillary service with a battery electric vehicle,” 2002
work page 2002
Show all 39 references
-
[8]
V2G Hub,
“V2G Hub,” UK Power Networks, Online available in: ‘https://www. v2g-hub.com/’, 2023, accessed: 16/08/2024
2023
-
[9]
Factors influencing consumer acceptance of vehicle-to- grid by electric vehicle drivers in the Netherlands,
K. van Heuveln, R. Ghotge, J. A. Annema, E. van Bergen, B. van Wee, and U. Pesch, “Factors influencing consumer acceptance of vehicle-to- grid by electric vehicle drivers in the Netherlands,” Travel Behaviour and Society, vol. 24, pp. 34–45, 2021
2021
-
[10]
Evaluating the impact of V2G services on the degradation of batteries in PHEV and EV,
J. D. Bishop, C. J. Axon, D. Bonilla, M. Tran, D. Banister, and M. D. McCulloch, “Evaluating the impact of V2G services on the degradation of batteries in PHEV and EV,” Applied energy, vol. 111, pp. 206–218, 2013. 12
2013
-
[11]
Quantifying electric vehicle battery degradation from driving vs. vehicle-to-grid services,
D. Wang, J. Coignard, T. Zeng, C. Zhang, and S. Saxena, “Quantifying electric vehicle battery degradation from driving vs. vehicle-to-grid services,” Journal of Power Sources , vol. 332, pp. 193–203, 2016
2016
-
[12]
Empirical capacity measurements of electric vehicles subject to battery degrada- tion from V2G services,
A. Thingvad, L. Calearo, P. B. Andersen, and M. Marinelli, “Empirical capacity measurements of electric vehicles subject to battery degrada- tion from V2G services,” IEEE Transactions on Vehicular Technology , vol. 70, no. 8, pp. 7547–7557, 2021
2021
-
[13]
A predictive two-stage user-centered algorithm for smart charging of plug-in electric vehicles considering the state of health of the battery,
R. Razi, K. Hajar, A. Hably, M. Gholami, S. Bacha, M. Mehrasa, A. Labonne, and H. Turker, “A predictive two-stage user-centered algorithm for smart charging of plug-in electric vehicles considering the state of health of the battery,” IEEE Transactions on Transportation Electr...
2023
-
[14]
A coordinated model predictive control-based approach for vehicle-to-grid scheduling considering range anxiety and battery degradation,
C.-F. Lu, G.-P. Liu, Y . Yu, and J. Cui, “A coordinated model predictive control-based approach for vehicle-to-grid scheduling considering range anxiety and battery degradation,” IEEE Transactions on Transportation Electrification, 2024
2024
-
[15]
Enhancing smart charging in electric vehicles by addressing paused and delayed charging problems,
N. Brinkel, T. van Wijk, A. Buijze, N. K. Panda, J. Meersmans, P. Markoti´c, B. van der Ree, H. Fidder, B. de Brey, S. Tindemans et al., “Enhancing smart charging in electric vehicles by addressing paused and delayed charging problems,” Nature Communications, vol. 15, no. 1, p...
2024
-
[17]
Multimodal physics-based aging model for life prediction of Li-ion batteries,
M. Safari, M. Morcrette, A. Teyssot, and C. Delacourt, “Multimodal physics-based aging model for life prediction of Li-ion batteries,” Journal of The Electrochemical Society , vol. 156, no. 3, p. A145, 2008
2008
-
[18]
Identifying degradation patterns of lithium ion batteries from impedance spectroscopy using machine learning,
Y . Zhang, Q. Tang, Y . Zhang, J. Wang, U. Stimming, and A. A. Lee, “Identifying degradation patterns of lithium ion batteries from impedance spectroscopy using machine learning,” Nature communica- tions, vol. 11, no. 1, p. 1706, 2020
2020
-
[19]
Data-driven prediction of battery cycle life before capacity degradation,
K. A. Severson, P. M. Attia, N. Jin, N. Perkins, B. Jiang, Z. Yang, M. H. Chen, M. Aykol, P. K. Herring, D. Fraggedakis et al. , “Data-driven prediction of battery cycle life before capacity degradation,” Nature Energy, vol. 4, no. 5, pp. 383–391, 2019
2019
-
[20]
Com- parison of plug-in hybrid electric vehicle battery life across geographies and drive-cycles,
K. Smith, M. Earleywine, E. Wood, J. Neubauer, and A. Pesaran, “Com- parison of plug-in hybrid electric vehicle battery life across geographies and drive-cycles,” National Renewable Energy Lab.(NREL), Golden, CO (United States), Tech. Rep., 2012
2012
-
[21]
User-centric vehicle-to-grid optimization with an input con- vex neural network-based battery degradation model,
A. Mallick, G. Pantazis, M. Khosravi, P. M. Esfahani, and S. Gram- matico, “User-centric vehicle-to-grid optimization with an input con- vex neural network-based battery degradation model,” arXiv preprint arXiv:2505.11047 (accepted in: 2025 IEEE 21st International Confer- ence...
2025 arXiv
-
[22]
Thru-life impacts of driver aggression, climate, cabin thermal management, and battery thermal management on battery electric vehicle utility,
J. Neubauer and E. Wood, “Thru-life impacts of driver aggression, climate, cabin thermal management, and battery thermal management on battery electric vehicle utility,” Journal of Power Sources , vol. 259, pp. 262–275, 2014
2014
-
[23]
A review on recent progress, challenges and perspective of battery thermal management system,
J. Lin, X. Liu, S. Li, C. Zhang, and S. Yang, “A review on recent progress, challenges and perspective of battery thermal management system,” International Journal of Heat and Mass Transfer , vol. 167, p. 120834, 2021
2021
-
[24]
NASA power,
“NASA power,” Online available in: https://power.larc.nasa.gov/ data-access-viewer/, accessed: 2025-05-29
2025
-
[25]
Generalized Nash equilibrium problems,
F. Facchinei and C. Kanzow, “Generalized Nash equilibrium problems,” Annals of Operations Research , vol. 175, no. 1, pp. 177–211, 2010
2010
-
[26]
Decomposition algo- rithms for generalized potential games,
F. Facchinei, V . Piccialli, and M. Sciandrone, “Decomposition algo- rithms for generalized potential games,” Computational Optimization and Applications, vol. 50, pp. 237–262, 2011
2011
-
[27]
Pricing for electric vehicle charging stations based on the responsiveness of demand,
S. Lai, J. Qiu, Y . Tao, and J. Zhao, “Pricing for electric vehicle charging stations based on the responsiveness of demand,” IEEE Transactions on Smart Grid, vol. 14, no. 1, pp. 530–544, 2022
2022
-
[28]
Effects of state of charge on the degradation of lifepo4/graphite batteries during accelerated storage test,
Y . Zheng, Y .-B. He, K. Qian, B. Li, X. Wang, J. Li, C. Miao, and F. Kang, “Effects of state of charge on the degradation of lifepo4/graphite batteries during accelerated storage test,” Journal of Alloys and Compounds , vol. 639, pp. 406–414, 2015
2015
-
[29]
Rahman and T
T. Rahman and T. Alharbi, “Exploring lithium-ion battery degradation: A concise review of critical factors, impacts, data-driven degradation estimation techniques, and sustainable directions for energy storage systems,” Batteries, vol. 10, no. 7, p. 220, 2024
2024
-
[30]
M. L. Bynum, G. A. Hackebeil, W. E. Hart, C. D. Laird, B. L. Nicholson, J. D. Siirola, J.-P. Watson, and D. L. Woodruff, Pyomo–optimization modeling in python, 3rd ed. Springer Science & Business Media, 2021, vol. 67
2021
-
[31]
ApS, The MOSEK optimization toolbox , 2019
M. ApS, The MOSEK optimization toolbox , 2019. [Online]. Available: http://docs.mosek.com/9.0/toolbox/index.html
2019
-
[32]
A review of bidirectional on-board chargers for electric vehicles,
J. Yuan, L. Dorn-Gomba, A. D. Callegaro, J. Reimers, and A. Emadi, “A review of bidirectional on-board chargers for electric vehicles,” IEEE Access, vol. 9, pp. 51 501–51 518, 2021
2021
-
[33]
A comprehensive overview of electric vehicle batteries market,
F. Mohammadi and M. Saif, “A comprehensive overview of electric vehicle batteries market,” e-Prime-Advances in Electrical Engineering, Electronics and Energy, vol. 3, p. 100127, 2023
2023
-
[34]
A bottom-up approach to lithium-ion battery cost modeling with a focus on cathode active materials,
M. Wentker, M. Greenwood, and J. Leker, “A bottom-up approach to lithium-ion battery cost modeling with a focus on cathode active materials,” Energies, vol. 12, no. 3, p. 504, 2019
2019
-
[35]
Procedure for assessing the suitability of battery second life applications after EV first life,
T. Montes, M. Etxandi-Santolaya, J. Eichman, V . J. Ferreira, L. Trilla, and C. Corchero, “Procedure for assessing the suitability of battery second life applications after EV first life,” Batteries, vol. 8, no. 9, p. 122, 2022
2022
-
[36]
Battery warm-up methodologies at subzero temperatures for automotive applications: Recent advances and perspectives,
X. Hu, Y . Zheng, D. A. Howey, H. Perez, A. Foley, and M. Pecht, “Battery warm-up methodologies at subzero temperatures for automotive applications: Recent advances and perspectives,” Progress in Energy and Combustion Science, vol. 77, p. 100806, 2020
2020
-
[37]
Added value of individual flexibility profiles of electric vehicle users for ancillary services,
P. B. Andersen, T. Sousa, A. Thingvad, L. S. Berthou, and M. Ku- lahci, “Added value of individual flexibility profiles of electric vehicle users for ancillary services,” in 2018 IEEE international conference on communications, control, and computing technologies for smart gri...
2018
-
[38]
Meteorological data portal,
“Meteorological data portal,” Online available in: https://www.tudelft.nl/en/ewi/over-de-faculteit/afdelingen/ electrical-sustainable-energy/photovoltaic-materials-and-devices/ dutch-pv-portal/meteorological-data, accessed: 2024-07-10
2024
-
[39]
A comprehensive review on the characteristics and modeling of lithium-ion battery aging,
W. Vermeer, G. R. C. Mouli, and P. Bauer, “A comprehensive review on the characteristics and modeling of lithium-ion battery aging,” IEEE Transactions on Transportation Electrification , vol. 8, no. 2, pp. 2205– 2232, 2021
2021
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