27
AAABBBAABABBBABBBABAAAAABBA
BBBBAABAABABBBBABABBABABBBB
ABBBAAABBBAAAAABBBAABABBAAA
BAABBABBBABAABBBBBBABAABAAA
BBAAABBAAABBABABAAAAAABBBAB
BAAAAAAABAABBBAABAABABBBABA
ABAABAAAABAAABABBABAAAAAABB
BBBBBBBBABABAABBBBABBBBAABA
ABABAABAABBBAAAAAABBBBBAABA
BBAAABBBABBAAABABAABABABAAA
BBBABBAABBBBBBBBAABBAABBBBA
ABAAAABABBBBBABAAAAABAABBAB
ABAAAABAABAAABBAAAABBAAABBB
AAAAAAABBAAABABAAABABBBABAB
AAABABBABABBABAABBAAABAABAB
AAAABAABAAAAABAABBBBABAABBA
BABBABABBBBBAAABAAAABABBBBB
BABBABBBABBBBABBABBBBAAABBA
BBAABBABBAABBABABABBABAABBA
BBBABBAABABABAAABABAABAAABA
BBBBABABABBBBAAABBBABBBBAAA
BBBBBBBBAABAABAABBAAABABBBB
BABBBBAAABAAABABAABAABABABB
BAAABBBBBBAABAABAAABBAAABAB
ABBAABBAABBABABBBBAABAAAAAB
BABBBABAAAAABAABBAAABAAAAAA
BABAABAAAAABBBBAABABAAABABB