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Discontinued operations (Details 2) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows generated from/(used in) discontinued operations      
Net cash generated from/(used in) operating activities ¥ (2,817) ¥ (27,875) ¥ 13,702
Net cash used in investing activities 0 (10) 0
Net cash generated from/(used in) financing activities (2,513) 17,904 0
Net increase/(decrease) in cash and cash equivalents ¥ (5,330) ¥ (9,981) ¥ 13,702