# American Institute of Mathematical Sciences

September  2017, 7(3): 359-377. doi: 10.3934/naco.2017023

## A multistage stochastic programming framework for cardinality constrained portfolio optimization

 1 Department of Systems Engineering, IHU University, Tehran, Iran 2 Department of Industrial Engineering, Faculty of Engineering, Kharazmi University, Tehran, Iran

* Corresponding author

Received  December 2016 Revised  July 2017 Published  July 2017

Fund Project: This paper was prepared at the occasion of The 12th International Conference on Industrial Engineering (ICIE 2016), Tehran, Iran, January 25-26,2016, with its Associate Editors of Numerical Algebra, Control and Optimization (NACO) being Assoc. Prof. A. (Nima) Mirzazadeh, Kharazmi University, Tehran, Iran, and Prof. Gerhard-Wilhelm Weber, Middle East Technical University, Ankara, Turkey.

This paper presents a multistage stochastic programming model to deal with multi-period, cardinality constrained portfolio optimization. The presented model aims to minimize investor's expected regret, while ensuring achievement of a minimum expected return. To generate scenarios of market index returns, a random walk model based on the empirical distribution of market-representative index returns is proposed. Then, a single index model is used to estimate stock returns based on market index returns. Afterward, historical returns of a number of stocks, selected from Frankfurt Stock Exchange (FSE), are used to implement the presented scenario generation method, and solve the stochastic programming model. In addition, the impact of cardinality constraints, transaction costs, minimum expected return and predetermined investor's target wealth are investigated. Results show that the inclusion of cardinality constraints and transaction costs significantly influences the investors risk-return tradeoffs. This is also the case for investors target wealth.

Citation: Ardeshir Ahmadi, Hamed Davari-Ardakani. A multistage stochastic programming framework for cardinality constrained portfolio optimization. Numerical Algebra, Control and Optimization, 2017, 7 (3) : 359-377. doi: 10.3934/naco.2017023
##### References:
 [1] D. Barro and E. Canestrelli, Tracking error: a multistage portfolio model, Ann. Oper. Res., 165 (2009), 47-66.  doi: 10.1007/s10479-007-0308-8. [2] M. R. Borges, Efficient market hypothesis in European stock markets, Eur. J. Financ., 16 (2010), 711-726. [3] W. Chen, Artificial bee colony algorithm for constrained possibilistic portfolio optimization problem, Physica A., 429 (2015), 125-139.  doi: 10.1016/j.physa.2015.02.060. [4] Z. Chen, Multiperiod consumption and portfolio decisions under the multivariate GARCH model with transaction costs and CVaR-based risk control, OR Spectrum., 27 (2005), 603-632. [5] Z. Chen and D. Xu, Knowledge-based scenario tree generation methods and application in multiperiod portfolio selection problem, Appl. Stoch. Model. Bus., 30 (2014), 240-257.  doi: 10.1002/asmb.1970. [6] Y. W. Cheung and K. S. Lai, A search for long memory in international stock market returns, J. Int. Money. Financ., 14 (1995), 597-615. [7] A. Consiglio and A. Staino, A stochastic programming model for the optimal issuance of government bonds, Ann. Oper. Res., 193 (2012), 159-172.  doi: 10.1007/s10479-010-0755-5. [8] G. B. Dantzig and G. Infanger, Multi-stage stochastic linear programs for portfolio optimization, Ann. Oper. Res., 45 (1993), 59-76.  doi: 10.1007/BF02282041. [9] H. Davari-Ardakani, M. Aminnayeri and A. Seifi, A study on modeling the dynamics of statistically dependent returns, Physica A., 405 (2014), 35-51.  doi: 10.1016/j.physa.2014.02.077. [10] H. Davari-Ardakani, M. Aminnayeri and A. Seifi, Hedging strategies for multi-period portfolio optimization, Sci. Iran., 22 (2015), 2644-2663. [11] H. Davari-Ardakani, M. Aminnayeri and A. Seifi, Multistage portfolio optimization with stocks and options, Int. Trans. Oper. Res., 23 (2016), 593-622.  doi: 10.1111/itor.12174. [12] R. Ferstl and A. Weissensteiner, Cash management using multi-stage stochastic programming, Quant. Financ., 10 (2010), 209-219.  doi: 10.1080/14697680802637908. [13] S. E. Fleten, K. Hoyland and S. W. Wallace, The performance of stochastic dynamic and fixed mix portfolio models, Eur. J. Oper. Res., 140 (2002), 37-49.  doi: 10.1016/S0377-2217(01)00195-3. [14] A. Geyer, M. Hanke and A. Weissensteiner, Scenario tree generation and multi-asset financial optimization problems, Oper. Res. lett., 41 (2013), 494-498.  doi: 10.1016/j.orl.2013.06.003. [15] N. Gülpinar, B. Rustem and R. Settergren, Simulation and optimization approaches to scenario tree generation, J. Econ. Dyn. Control., 28 (2004), 1291-1315.  doi: 10.1016/S0165-1889(03)00113-1. [16] P. Gupta, G. Mittal and M. K. Mehlawat, Multiobjective expected value model for portfolio selection in fuzzy environment, Optim. Lett., 7 (2013), 1765-1791.  doi: 10.1007/s11590-012-0521-5. [17] P. Gupta, G. Mittal and M. K. Mehlawat, A multi-period fuzzy portfolio optimization model with minimum transaction lots, Eur. J. Oper. Res., 242 (2015), 933-941.  doi: 10.1016/j.ejor.2014.10.061. [18] K. Hoyland and S. W. Wallace, Generating scenario trees for multistage decision problems, Manage. Sci., 47 (2001), 295-307. [19] K. Hoyland, M. Kaut and S. W. Wallace, A heuristic for moment-matching scenario generation, Comput. Optim. Appl., 24 (2003), 169-185.  doi: 10.1023/A:1021853807313. [20] B. Jacobsen, Long term dependence in stock returns, J. Eimpir. Financ., 3 (1996), 393-417. [21] X. Ji, Sh. Zhu, Sh. Wang and Sh. Zhang, A stochastic linear goal programming approach to multistage portfolio management based on scenario generation via linear programming, IIE. Trans., 37 (2005), 957-969. [22] T. Lux, Long term stochastic dependence in financial prices: evidence from German stock market, Appl. Econ. Lett., 3 (1996), 701-706. [23] R. Mansini, W. Ogryczak and M. G. Speranza, Twenty years of linear programming based portfolio optimization, Eur. J. Oper. Res., 234 (2014), 518-535.  doi: 10.1016/j.ejor.2013.08.035. [24] H. Markowitz, Advantages of multiperiod portfolio models, J. Portfolio. Manage., 29 (2003), 35-45. [25] J. M. Mulvey, W. R. Pauling and R. E. Madey, Portfolio selection, J. Financ., 7 (1952), 77-91. [26] P. Rocha and D. Kuhn, Multistage stochastic portfolio optimisation in deregulated electricity markets using linear decision rules, Eur. J. Oper. Res., 216 (2012), 397-408.  doi: 10.1016/j.ejor.2011.08.001. [27] C. T. Şakar and M. Köksalan, A stochastic programming approach to multicriteria portfolio optimization, J. Global. Optim., 57 (2013), 299-314.  doi: 10.1007/s10898-012-0005-2. [28] A. Sensoy and B. M. Tabak, Time-varying long term memory in the European Union stock markets, Physica A., 436 (2015), 147-158. [29] J. F. Slifker and S. S. Shapiro, The Johnson system: selection and parameter estimation, Technometrics., 22 (1980), 239-246. [30] N. Topaloglou, H. Vladimirou and S. A. Zenios, A dynamic stochastic programming model for international portfolio management, J. Bank. Financ., 26 (2008), 1501-1524.  doi: 10.1016/j.ejor.2005.07.035. [31] N. Topaloglou, H. Vladimirou and S. A. Zenios, Optimizing international portfolios with options and forwards, J. Bank. Financ., 35 (2011), 3188-3201. [32] A. C. Worthington and H. Higgs, Random walks and market efficiency in European equity markets, Global. J. Financ. Econ., 1 (2004), 59-78. [33] L. Yin and L. Han, International assets allocation with risk management via multi-stage stochastic programming, Comput. Econ., (2013).  doi: 10.1007/s10614-013-9365-z. [34] L. Yin and L. Han, Options strategies for international portfolios with overall risk management via multi-stage stochastic programming, Ann. Oper. Res., 206 (2013), 557-576.  doi: 10.1007/s10479-013-1375-7. [35] P. Zhang, An interval mean-average absolute deviation model for multiperiod portfolio selection with risk control and cardinality constraints, Soft. Comput., 20 (2016), 1203-1212.

show all references

##### References:
 [1] D. Barro and E. Canestrelli, Tracking error: a multistage portfolio model, Ann. Oper. Res., 165 (2009), 47-66.  doi: 10.1007/s10479-007-0308-8. [2] M. R. Borges, Efficient market hypothesis in European stock markets, Eur. J. Financ., 16 (2010), 711-726. [3] W. Chen, Artificial bee colony algorithm for constrained possibilistic portfolio optimization problem, Physica A., 429 (2015), 125-139.  doi: 10.1016/j.physa.2015.02.060. [4] Z. Chen, Multiperiod consumption and portfolio decisions under the multivariate GARCH model with transaction costs and CVaR-based risk control, OR Spectrum., 27 (2005), 603-632. [5] Z. Chen and D. Xu, Knowledge-based scenario tree generation methods and application in multiperiod portfolio selection problem, Appl. Stoch. Model. Bus., 30 (2014), 240-257.  doi: 10.1002/asmb.1970. [6] Y. W. Cheung and K. S. Lai, A search for long memory in international stock market returns, J. Int. Money. Financ., 14 (1995), 597-615. [7] A. Consiglio and A. Staino, A stochastic programming model for the optimal issuance of government bonds, Ann. Oper. Res., 193 (2012), 159-172.  doi: 10.1007/s10479-010-0755-5. [8] G. B. Dantzig and G. Infanger, Multi-stage stochastic linear programs for portfolio optimization, Ann. Oper. Res., 45 (1993), 59-76.  doi: 10.1007/BF02282041. [9] H. Davari-Ardakani, M. Aminnayeri and A. Seifi, A study on modeling the dynamics of statistically dependent returns, Physica A., 405 (2014), 35-51.  doi: 10.1016/j.physa.2014.02.077. [10] H. Davari-Ardakani, M. Aminnayeri and A. Seifi, Hedging strategies for multi-period portfolio optimization, Sci. Iran., 22 (2015), 2644-2663. [11] H. Davari-Ardakani, M. Aminnayeri and A. Seifi, Multistage portfolio optimization with stocks and options, Int. Trans. Oper. Res., 23 (2016), 593-622.  doi: 10.1111/itor.12174. [12] R. Ferstl and A. Weissensteiner, Cash management using multi-stage stochastic programming, Quant. Financ., 10 (2010), 209-219.  doi: 10.1080/14697680802637908. [13] S. E. Fleten, K. Hoyland and S. W. Wallace, The performance of stochastic dynamic and fixed mix portfolio models, Eur. J. Oper. Res., 140 (2002), 37-49.  doi: 10.1016/S0377-2217(01)00195-3. [14] A. Geyer, M. Hanke and A. Weissensteiner, Scenario tree generation and multi-asset financial optimization problems, Oper. Res. lett., 41 (2013), 494-498.  doi: 10.1016/j.orl.2013.06.003. [15] N. Gülpinar, B. Rustem and R. Settergren, Simulation and optimization approaches to scenario tree generation, J. Econ. Dyn. Control., 28 (2004), 1291-1315.  doi: 10.1016/S0165-1889(03)00113-1. [16] P. Gupta, G. Mittal and M. K. Mehlawat, Multiobjective expected value model for portfolio selection in fuzzy environment, Optim. Lett., 7 (2013), 1765-1791.  doi: 10.1007/s11590-012-0521-5. [17] P. Gupta, G. Mittal and M. K. Mehlawat, A multi-period fuzzy portfolio optimization model with minimum transaction lots, Eur. J. Oper. Res., 242 (2015), 933-941.  doi: 10.1016/j.ejor.2014.10.061. [18] K. Hoyland and S. W. Wallace, Generating scenario trees for multistage decision problems, Manage. Sci., 47 (2001), 295-307. [19] K. Hoyland, M. Kaut and S. W. Wallace, A heuristic for moment-matching scenario generation, Comput. Optim. Appl., 24 (2003), 169-185.  doi: 10.1023/A:1021853807313. [20] B. Jacobsen, Long term dependence in stock returns, J. Eimpir. Financ., 3 (1996), 393-417. [21] X. Ji, Sh. Zhu, Sh. Wang and Sh. Zhang, A stochastic linear goal programming approach to multistage portfolio management based on scenario generation via linear programming, IIE. Trans., 37 (2005), 957-969. [22] T. Lux, Long term stochastic dependence in financial prices: evidence from German stock market, Appl. Econ. Lett., 3 (1996), 701-706. [23] R. Mansini, W. Ogryczak and M. G. Speranza, Twenty years of linear programming based portfolio optimization, Eur. J. Oper. Res., 234 (2014), 518-535.  doi: 10.1016/j.ejor.2013.08.035. [24] H. Markowitz, Advantages of multiperiod portfolio models, J. Portfolio. Manage., 29 (2003), 35-45. [25] J. M. Mulvey, W. R. Pauling and R. E. Madey, Portfolio selection, J. Financ., 7 (1952), 77-91. [26] P. Rocha and D. Kuhn, Multistage stochastic portfolio optimisation in deregulated electricity markets using linear decision rules, Eur. J. Oper. Res., 216 (2012), 397-408.  doi: 10.1016/j.ejor.2011.08.001. [27] C. T. Şakar and M. Köksalan, A stochastic programming approach to multicriteria portfolio optimization, J. Global. Optim., 57 (2013), 299-314.  doi: 10.1007/s10898-012-0005-2. [28] A. Sensoy and B. M. Tabak, Time-varying long term memory in the European Union stock markets, Physica A., 436 (2015), 147-158. [29] J. F. Slifker and S. S. Shapiro, The Johnson system: selection and parameter estimation, Technometrics., 22 (1980), 239-246. [30] N. Topaloglou, H. Vladimirou and S. A. Zenios, A dynamic stochastic programming model for international portfolio management, J. Bank. Financ., 26 (2008), 1501-1524.  doi: 10.1016/j.ejor.2005.07.035. [31] N. Topaloglou, H. Vladimirou and S. A. Zenios, Optimizing international portfolios with options and forwards, J. Bank. Financ., 35 (2011), 3188-3201. [32] A. C. Worthington and H. Higgs, Random walks and market efficiency in European equity markets, Global. J. Financ. Econ., 1 (2004), 59-78. [33] L. Yin and L. Han, International assets allocation with risk management via multi-stage stochastic programming, Comput. Econ., (2013).  doi: 10.1007/s10614-013-9365-z. [34] L. Yin and L. Han, Options strategies for international portfolios with overall risk management via multi-stage stochastic programming, Ann. Oper. Res., 206 (2013), 557-576.  doi: 10.1007/s10479-013-1375-7. [35] P. Zhang, An interval mean-average absolute deviation model for multiperiod portfolio selection with risk control and cardinality constraints, Soft. Comput., 20 (2016), 1203-1212.
The schematic representation of a scenario tree for T periods
A schematic representation of the proposed scenario tree generation method
Risk vs. expected return for portfolios with and without cardinality constraints (Target wealth = ＄1000000)
Risk vs. expected return obtained by setting different levels of target wealth (＄1000000 and ＄1050000) for portfolios with and without cardinality constraints
Investor's risk for different levels of proportional transaction costs
Descriptive statistics of historical CDAX returns
 Mean Standard Deviation Median Minimum Maximum Skewness Kurtosis 0.0060 0.0569 0.0103 -0.1795 0.1745 -0.5381 1.7814
 Mean Standard Deviation Median Minimum Maximum Skewness Kurtosis 0.0060 0.0569 0.0103 -0.1795 0.1745 -0.5381 1.7814
αi and βi values of the single index model for all stocks
 Stock B & A LR81 LTEC MZA NEC1 N2X OTP Intercept 0.015231 0.0008692 -0.0028 0.039533 -3.1E-05 0.001772 -0.01099 Slope 0.756845 1.211379 0.889253 1.837928 0.644086 0.971493 1.961487 Stock SIE TAH BMW XCY O4B ZYT - Intercept -.00063 0.006095 0.0098 0.024254 0.001565 0.003712 - Slope 1.091311 0.292933 1.186136 0.592039 0.564903 1.498048 -
 Stock B & A LR81 LTEC MZA NEC1 N2X OTP Intercept 0.015231 0.0008692 -0.0028 0.039533 -3.1E-05 0.001772 -0.01099 Slope 0.756845 1.211379 0.889253 1.837928 0.644086 0.971493 1.961487 Stock SIE TAH BMW XCY O4B ZYT - Intercept -.00063 0.006095 0.0098 0.024254 0.001565 0.003712 - Slope 1.091311 0.292933 1.186136 0.592039 0.564903 1.498048 -
Investor's expected regret considering different target wealth, minimum expected return and proportional transaction costs
 Target wealth 1000000 1050000 1100000 Proportional transaction cost 0 0.01 0.02 0 0.01 0.02 0 0.01 0.02 0.95 0 0 0 63429.6 85112.7 103678.9 157646.9 196749.4 223658.1 0.99 0 0 0 63429.6 85112.7 103678.9 157646.9 196749.4 223658.1 1.01 0 1290.1 2987.9 63429.6 85112.7 103678.9 157646.9 196749.4 223658.1 1.03 36.1 3953.9 9018.7 63429.6 85112.7 103678.9 157646.9 196749.4 223658.1 1.04 400.0 5567.1 12654.5 63429.6 85112.7 103678.9 157646.9 196749.4 223658.1 1.05 1142.6 7705.6 17739.6 63429.6 85112.7 104334.1 157646.9 196749.4 223658.1 1.06 2350.1 11121.8 26179.7 63429.6 85134.9 109571.7 157646.9 196749.4 223838.3 1.07 3904.2 15907.5 37152.7 63429.6 87879.1 118868.3 157646.9 198064.3 226873.5 1.08 5954.9 22562.9 49694.6 63429.6 95349.1 129104.5 157646.9 202106.9 232405.6 1.09 8525.3 36300.4 66271.2 63694.1 106415.1 140267.7 157646.9 208788.3 240209 1.10 12086.2 54243.7 88133.5 64838.1 120626.0 157811.5 157675.5 217600.2 251621.1 1.11 17279.9 74827.6 - 67119.8 138148.1 - 158591.5 228534.1 - 1.12 24358.6 98255.0 - 74520.5 159434.9 - 163337.6 242911.9 - 1.13 52656.5 - - 104774.3 - - 185917.5 - - 1.14 - - - - - - - - -
 Target wealth 1000000 1050000 1100000 Proportional transaction cost 0 0.01 0.02 0 0.01 0.02 0 0.01 0.02 0.95 0 0 0 63429.6 85112.7 103678.9 157646.9 196749.4 223658.1 0.99 0 0 0 63429.6 85112.7 103678.9 157646.9 196749.4 223658.1 1.01 0 1290.1 2987.9 63429.6 85112.7 103678.9 157646.9 196749.4 223658.1 1.03 36.1 3953.9 9018.7 63429.6 85112.7 103678.9 157646.9 196749.4 223658.1 1.04 400.0 5567.1 12654.5 63429.6 85112.7 103678.9 157646.9 196749.4 223658.1 1.05 1142.6 7705.6 17739.6 63429.6 85112.7 104334.1 157646.9 196749.4 223658.1 1.06 2350.1 11121.8 26179.7 63429.6 85134.9 109571.7 157646.9 196749.4 223838.3 1.07 3904.2 15907.5 37152.7 63429.6 87879.1 118868.3 157646.9 198064.3 226873.5 1.08 5954.9 22562.9 49694.6 63429.6 95349.1 129104.5 157646.9 202106.9 232405.6 1.09 8525.3 36300.4 66271.2 63694.1 106415.1 140267.7 157646.9 208788.3 240209 1.10 12086.2 54243.7 88133.5 64838.1 120626.0 157811.5 157675.5 217600.2 251621.1 1.11 17279.9 74827.6 - 67119.8 138148.1 - 158591.5 228534.1 - 1.12 24358.6 98255.0 - 74520.5 159434.9 - 163337.6 242911.9 - 1.13 52656.5 - - 104774.3 - - 185917.5 - - 1.14 - - - - - - - - -
Investor's expected regret considering different target wealth and minimum expected return with and without cardinality
 Cardinality Constraints No Cardinality Constraints Target wealth 1000000 1050000 1100000 1000000 1050000 1100000 0.95 0 81742.31 192944.5 0 63429.62 157646.9 0.99 0 81742.31 192944.5 0 63429.62 157646.9 1 0 81742.31 192944.5 0 63429.62 157646.9 1.01 0 81742.31 192944.5 0 63429.62 157646.9 1.02 197.428 81742.31 192944.5 0 63429.62 157646.9 1.03 893.094 81742.31 192944.5 36.097 63429.62 157646.9 1.04 2574.389 81742.31 192944.5 399.947 63429.62 157646.9 1.05 5261.672 81879.22 192944.5 1142.637 63429.62 157646.9 1.06 8917.349 82803.35 192944.5 2350.142 63429.62 157646.9 1.07 18358.44 87336.35 193443 3904.241 63429.62 157646.9 1.08 35077.99 96174.55 198126.4 5954.918 63429.62 157646.9 1.09 - - - 8525.318 63694.05 157646.9 1.10 - - - 12086.15 64838.09 157675.5 1.11 - - - 17279.88 67119.82 158591.5 1.12 - - - 24358.63 74520.5 163337.6 1.13 - - - 52656.51 104774.3 185917.5 1.14 - - - - - -
 Cardinality Constraints No Cardinality Constraints Target wealth 1000000 1050000 1100000 1000000 1050000 1100000 0.95 0 81742.31 192944.5 0 63429.62 157646.9 0.99 0 81742.31 192944.5 0 63429.62 157646.9 1 0 81742.31 192944.5 0 63429.62 157646.9 1.01 0 81742.31 192944.5 0 63429.62 157646.9 1.02 197.428 81742.31 192944.5 0 63429.62 157646.9 1.03 893.094 81742.31 192944.5 36.097 63429.62 157646.9 1.04 2574.389 81742.31 192944.5 399.947 63429.62 157646.9 1.05 5261.672 81879.22 192944.5 1142.637 63429.62 157646.9 1.06 8917.349 82803.35 192944.5 2350.142 63429.62 157646.9 1.07 18358.44 87336.35 193443 3904.241 63429.62 157646.9 1.08 35077.99 96174.55 198126.4 5954.918 63429.62 157646.9 1.09 - - - 8525.318 63694.05 157646.9 1.10 - - - 12086.15 64838.09 157675.5 1.11 - - - 17279.88 67119.82 158591.5 1.12 - - - 24358.63 74520.5 163337.6 1.13 - - - 52656.51 104774.3 185917.5 1.14 - - - - - -
Investor's expected regret considering different proportional transaction costs and number of assets
 Number of assets 6 12 Proportional transaction cost 0 0.01 0.02 0 0.01 0.02 0.95 229314.2 275191.5 318875.4 192944.5 225372.1 258752.1 0.99 229314.2 275191.5 318875.4 192944.5 225372.1 258752.1 1.01 229314.2 275191.5 318875.4 192944.5 225372.1 258752.1 1.03 229314.2 275191.5 318875.4 192944.5 225372.1 258752.1 1.04 229314.2 275191.5 318875.4 192944.5 225372.1 258752.1 1.05 229314.2 275191.5 320958.9 192944.5 225372.1 258752.1 1.06 229314.2 277364.2 338961.2 192944.5 225372.1 258752.1 1.07 229314.2 280367.1 - 192944.5 230553.7 263452.1 1.08 229314.3 - - 192944.5 235638.9 - 1.09 231175.9 - - 193443.0 239987.4 - 1.10 - - - 198126.4 - - 1.11 - - - - - -
 Number of assets 6 12 Proportional transaction cost 0 0.01 0.02 0 0.01 0.02 0.95 229314.2 275191.5 318875.4 192944.5 225372.1 258752.1 0.99 229314.2 275191.5 318875.4 192944.5 225372.1 258752.1 1.01 229314.2 275191.5 318875.4 192944.5 225372.1 258752.1 1.03 229314.2 275191.5 318875.4 192944.5 225372.1 258752.1 1.04 229314.2 275191.5 318875.4 192944.5 225372.1 258752.1 1.05 229314.2 275191.5 320958.9 192944.5 225372.1 258752.1 1.06 229314.2 277364.2 338961.2 192944.5 225372.1 258752.1 1.07 229314.2 280367.1 - 192944.5 230553.7 263452.1 1.08 229314.3 - - 192944.5 235638.9 - 1.09 231175.9 - - 193443.0 239987.4 - 1.10 - - - 198126.4 - - 1.11 - - - - - -
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