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7. Cash and cash equivalents (Tables) | 12 Months Ended
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Dec. 31, 2017
Cash And Cash Equivalents Tables |
Cash and cash equivalents |
| December 31, 2017 | December 31, 2016
Cash and banks | 171,951 | 137,395
Cash equivalents | 2,111,096 | 1,748,826
| 2,283,047 | 1,886,221

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