C1111233131211111211113313331333133313232321333133313332213223111   >>    C111123313121111121111331333133313331323232133313331333221322311   <<    C1111233131211111211113313331333133313232321333133313332213223113   >>      C1111233131211111211113313331333133313232321333133313332213223112   >>