Loop of length 24 starting with a string of length 8
found after enumerating 1295987 derivations:

.b.ccccbbc
	rule b -> caa at position 0
.caa.ccccbbc
	rule acc -> cbb at position 2
.cacbb.ccbbc
	rule b -> caa at position 4
.cacbcaa.ccbbc
	rule acc -> cbb at position 6
.cacbcacbb.bbc
	rule b -> caa at position 7
.cacbcaccaab.bbc
	rule acc -> cbb at position 5
.cacbccbbaab.bbc
	rule b -> caa at position 6
.cacbcccaabaab.bbc
	rule b -> caa at position 9
.cacbcccaacaaaab.bbc
	rule b -> caa at position 14
.cacbcccaacaaaacaa.bbc
	rule ab ->  at position 16
.cacbcccaacaaaaca.bc
	rule ab ->  at position 15
.cacbcccaacaaaac.c
	rule acc -> cbb at position 13
.cacbcccaacaaacbb.
	rule b -> caa at position 14
.cacbcccaacaaaccaab.
	rule acc -> cbb at position 12
.cacbcccaacaacbbaab.
	rule b -> caa at position 13
.cacbcccaacaaccaabaab.
	rule acc -> cbb at position 11
.cacbcccaacacbbaabaab.
	rule b -> caa at position 12
.cacbcccaacaccaabaabaab.
	rule acc -> cbb at position 10
.cacbcccaaccbbaabaabaab.
	rule acc -> cbb at position 8
.cacbcccacbbbbaabaabaab.
	rule b -> caa at position 9
.cacbcccaccaabbbaabaabaab.
	rule acc -> cbb at position 7
.cacbccccbbaabbbaabaabaab.
	rule ab ->  at position 11
.cacbccccbbabbaabaabaab.
	rule ab ->  at position 10
.cacbccccbbbaabaabaab.
	rule b -> caa at position 10
.cacbccccbbcaaaabaabaab.