20 20 100 100
AABAABBBBABAAAABABBA
AAABAABBAABBABAAABBB
AABAAABBBABAAAAAAABB
AABBBBAAAABABBAAAAAA
AAAABBAAAAAAABBBABBB
ABAABABBBBBABAABBAAB
AABBBBBBBAAABBAAAAAA
ABBAABAABAAABAAABAAB
ABBABBBAAABBBBBABAAB
ABBABBBABAAABABBAABB
ABAAABBBBABAABABABAA
BABAABABAAAAABABABAA
BBBBABAAAABBBABABABA
AABABAABAABAAAABAAAB
BABBBBAAABBBBAABAAAB
BAABAAABBBABAAAABABB
BBABBAAABAAABBBBBAAA
AAAAABAAAABAAAABABAA
AABAABAAABBABBBBAAAB
AAABAAAABBABABAABAAA