Loop of length 15 starting with a string of length 6
found after enumerating 10805 derivations:

.a.bcbcc
	rule a -> b at position 0
.b.bcbcc
	rule bbc -> acccaa at position 0
.acccaa.bcc
	rule a -> b at position 4
.acccba.bcc
	rule a -> b at position 5
.acccbb.bcc
	rule bbc -> acccaa at position 5
.acccbacccaa.c
	rule a -> b at position 5
.acccbbcccaa.c
	rule bbc -> acccaa at position 4
.acccacccaaccaa.c
	rule a -> b at position 8
.acccacccbaccaa.c
	rule a -> b at position 9
.acccacccbbccaa.c
	rule bbc -> acccaa at position 8
.acccacccacccaacaa.c
	rule a -> b at position 13
.acccacccacccabcaa.c
	rule a -> b at position 15
.acccacccacccabcba.c
	rule a -> b at position 16
.acccacccacccabcbb.c
	rule bbc -> acccaa at position 15
.acccacccacccabcacccaa.
	rule a -> b at position 15
.acccacccacccabcbcccaa.