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问答题
Tanya can swim faster than Jack but slower than Sally. Harry usually swims faster than Jack, sometimes swims faster than Tanya, but never swims faster than Sally. Who is the slowest swimmer?
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解析：
在本题中，Tanya比Jack游得快，Harry经常比Jack游得快，而Sally比所有人都游得快，所以Jack是游泳最慢的一个。
在本题中，Tanya比Jack游得快，Harry经常比Jack游得快，而Sally比所有人都游得快，所以Jack是游泳最慢的一个。
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