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There are 5 locks and 5 keys on a desk.8964 copyright protection239ＰＥＮＡＮＡ5f1GC42KsI 維尼

Each key can only open a lock.8964 copyright protection239ＰＥＮＡＮＡqoOhutwvZO 維尼

At most, you need to try how many times to make a pair of all the locks and keys ?8964 copyright protection239ＰＥＮＡＮＡP15wDSf0OH 維尼

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