Loop of length 10 starting with a string of length 10
found after enumerating 234 derivations:

.aaba.bababa
	rule aaba -> ababbaa at position 0
.ababbaa.bababa
	rule aaba -> ababbaa at position 5
.ababbababbaa.baba
	rule aaba -> ababbaa at position 10
.ababbababbababbaa.ba
	rule aaba -> ababbaa at position 15
.ababbababbababbababbaa.
	rule abbaba -> ababaa at position 12
.ababbababbabababaabbaa.
	rule abbaba -> ababaa at position 7
.ababbabababaababaabbaa.
	rule abbaba -> ababaa at position 2
.abababaababaababaabbaa.
	rule aaba -> ababbaa at position 11
.abababaababababbaabaabbaa.
	rule aaba -> ababbaa at position 16
.abababaababababbababbaaabbaa.
	rule abbaba -> ababaa at position 13
.abababaabababababaabbaaabbaa.