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If;Zhang;San;had;borne;a;babay;at; K,;she;must;have;got;pregnant;at;K-1.With;a;light;bulb;on;at; K,;it;can;be;concluded;that;the;light;bulb;must;have;been;turned;on;at;K-1.
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If Zhangsan gives birth to a baby, it means that she got pragnant at the time of K-1. If the lamp lightens at the time of K, it signifies that it was ...