Loop of length 23 starting with a string of length 4
found after enumerating 1865 derivations:

.ca.aa
	rule ca -> babcc at position 0
.babcc.aa
	rule ca -> babcc at position 4
.babcbabcc.a
	rule a ->  at position 5
.babcbbcc.a
	rule bb -> ac at position 4
.babcaccc.a
	rule ca -> babcc at position 3
.babbabccccc.a
	rule bb -> ac at position 2
.baacabccccc.a
	rule ca -> babcc at position 10
.baacabccccbabcc.
	rule a ->  at position 11
.baacabccccbbcc.
	rule bb -> ac at position 10
.baacabccccaccc.
	rule ca -> babcc at position 9
.baacabcccbabccccc.
	rule a ->  at position 10
.baacabcccbbccccc.
	rule bb -> ac at position 9
.baacabcccacccccc.
	rule ca -> babcc at position 8
.baacabccbabcccccccc.
	rule a ->  at position 9
.baacabccbbcccccccc.
	rule bb -> ac at position 8
.baacabccaccccccccc.
	rule ca -> babcc at position 7
.baacabcbabccccccccccc.
	rule a ->  at position 8
.baacabcbbccccccccccc.
	rule bb -> ac at position 7
.baacabcacccccccccccc.
	rule ca -> babcc at position 6
.baacabbabcccccccccccccc.
	rule bb -> ac at position 5
.baacaacabcccccccccccccc.
	rule ca -> babcc at position 6
.baacaababccbcccccccccccccc.
	rule a ->  at position 7
.baacaabbccbcccccccccccccc.
	rule bb -> ac at position 6
.baacaaacccbcccccccccccccc.