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(A (aa (aab, aac, aaa), ab (aba, abb, abc), ac (acb, acc, aca)), B (ba…
A
aa
aab
aac
aaa
ab
aba
abb
abc
ac
acb
acc
aca
B
ba
bac
bab
baa
bb
bba
bbc
bbb
cb
cba
cbb
cbc
C
ca
cab
caa
cac
cc
ccb
cca
ccc
cb
cba
cbb
cbc