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

Правка en1, от thedesalizes, 2022-06-15 12:33:26

1671E

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 ABBABBA AAAAAAA B ABABBBA AAAAAAA

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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)