进入上空0离开上空0WHILETRUEtrueGTleft20000进入上空msMixly进入上空：Mixlyx进入上空trueGTright20000离开上空msMixly离开上空Mixlyx离开上空FalseMixlyxMINUS1离开上空1进入上空0MixlyMINUS1离开上空1进入上空{}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