20
A
Z
X
OO
IT
BOB
DFF
GGR
TTTTTTTTTT
BABA
BABCIA
ABACABA
UFOKIUF
ABCDEFGHIJ
ABCDEFGHIA
GHGHGHGHGH
GHGHGHGHG
TUETUFGTUETU
ABLAXXXXABLA
ABAAABCCABAAAB