A A B A A B A __
A
A B A B A B A ___
B
A B C C A __ C C A B C C
A B A A B A A B A ___
A B C C D A B C C D A B C ___ D
C
Where is the mistake 2, 4, 6, 8, 10, 11, 14, 16, 18, 20
the 11 should be a 12
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