你的任务是给房间换上地板砖：每次换下一个十字形，两次换过的地板(砖)还会还原。
Your task is to replace the floor tile room: each replaced a cross, two replaced by the floor (tile) will be restored.
你的任务是给房间换上地板砖：每次换下一个十字形，两次换过的地板(砖)还会还原。
Your task is to replace the floor tile room: each replaced a cross, two replaced by the floor (tile) will be restored.
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