C1111233131211111211113313331333133313232321333133313331313233121221   >>    C111123313121111121111331333133313331323232133313331333131323312122   <<    C1111233131211111211113313331333133313232321333133313331313233121223   >>      C1111233131211111211113313331333133313232321333133313331313233121222   >>