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23 Post-employment benefits (Details 4) - Participants | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Unified Plan [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Number of active participants | 27 | 33
Number of inactive participants | 4,337 | 4,368
Number of dependent people |  |
Total | 4,364 | 4,401
Plan III [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Number of active participants | 7,647 | 8,180
Number of inactive participants | 4,324 | 3,843
Total | 11,971 | 12,023
Assistance Plan [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Number of active participants | 6,963 | 7,427
Number of inactive participants | 8,433 | 8,174
Number of dependent people | 22,183 | 22,472
Total | 37,579 | 38,073

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