Why the answer is 16 but not 8 in Example 1? I can only figure out the 8 strings below
- B AAAAAAA ABBABAB
- B AAAAAAA ABBABBA
- B AAAAAAA ABABBAB
- B AAAAAAA ABABBBA
- B ABBABAB AAAAAAA
- B ABBABBA AAAAAAA
- B ABABBAB AAAAAAA
- B ABABBBA AAAAAAA
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