Anyone can explain the Examples 1 in 1671E to me?

Правка en3, от thedesalizes, 2022-06-15 12:36:01

1671E

Why the answer is 16 but not 8 in Example 1? I can only figure out the 8 strings below

  1. B AAAAAAA ABBABAB
  2. B AAAAAAA ABBABBA
  3. B AAAAAAA ABABBAB
  4. B AAAAAAA ABABBBA
  5. B ABBABAB AAAAAAA
  6. B ABBABBA AAAAAAA
  7. B ABABBAB AAAAAAA
  8. B ABABBBA AAAAAAA

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  Rev. Язык Кто Когда Δ Комментарий
en3 Английский thedesalizes 2022-06-15 12:36:01 2 Tiny change: 'A\n7. B ABBABBA AAAAAAA\n' -> 'A\n7. B ABABBAB AAAAAAA\n'
en2 Английский thedesalizes 2022-06-15 12:34:25 24
en1 Английский thedesalizes 2022-06-15 12:33:26 353 Initial revision (published)