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(b (ba (bbc, bbb, bba), bb (bba, bbc), bc), c (ca (cca, ccb, ccc), cb (ccc…
b
ba
bbc
bbb
bba
bb
bba
bbc
bc
c
ca
cca
ccb
ccc
cb
ccc
ccc
cc
ccb
a
ac
aab
aaa
aac
aa
aac
abc
aab
aaa
ab
aac