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(1)AC∩BD=_______;
(2)平面AB1∩平面A1C1=________;
(3)平面A1C1CA∩平面AC=________;
(4)平面A1C1CA∩平面D1B1BD=_________;
(5)平面A1C1∩平面AB1∩平面B1C=_________;
(6)A1B1∩B1B∩B1C1=_________.