0
2
6
18
ABC C A D ACD B ABC BCD A A
1C 2A3ACD 4B5D6C7A8BD
1ABCD2AC3B4D5ABCD6B7D8ABCD9B10A
1D2ABCD3B4C5A6D7C8ACD9A 10A
1C2B3D4D5ABC6A7C8D9A10A
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