It's black,but you say it's clean.It' white,but you say it's not clean.What is it

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It's black,but you say it's clean.It' white,but you say it's not clean.What is it
本来是黑的，你偏要说是白的，本来是白的，你偏要说是黑的，到底是什么？
blackboard
blackboard
blackboard
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