20 19 769561679 618893586
AABABBBBBBBABAABBBA
BBAAAABAAAAAAABAABB
ABBABBABAAABBBAAAAB
BBBBBAABAAABBBAAAAA
BABBBBABBBAAAAABBAA
BABBBBBAABAAAABABAA
BABBBAAABAABBBBBBBB
AABBBBAABABBABBBAAB
BAABBBABAAAAAABBBBA
BBAAABBBBBBAABBAABB
ABAAABBAABBBAABABAB
BBBBBBABBABABBBABAB
AABBBBAABAAABBBABAB
BBAABBABBBAABABBAAA
AABBAAAABBAABBBBBAB
ABAABBBABABABABABAA
ABAABBAAAAAABBBAAAA
AAABABABBBBBABABABA
BBAABAAAABABBBBAAAB
ABBAABABBAABBAABBBA