10
ABCDEFGHI
GHIABCDEF
aBBccDDeeFFF
DeeFFFaBBccD
aBBccDDeeFFF
DeeFFFaBBccd
AbCCCCCCCCD
CCCCCCCDAab
aabababababa
abababababab
babAAAAAAAA
AAAAAAAAAbab
AAABBBB
BBBBAAA
AAAABBB
BBBBBAA
AAAAABB
BAAAAAB
AAAAAAB
AAAAAAB