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There are 5 locks and 5 keys on a desk.8964 copyright protection227PENANA2QcCFh4QL6 維尼
Each key can only open a lock.8964 copyright protection227PENANArzPn2137fc 維尼
At most, you need to try how many times to make a pair of all the locks and keys ?8964 copyright protection227PENANAXMc8aQOZsV 維尼
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