C1111233131211111211113313331333133313232321333133313331323123232223221   >>    C111123313121111121111331333133313331323232133313331333132312323222322   <<    C1111233131211111211113313331333133313232321333133313331323123232223223   >>      C1111233131211111211113313331333133313232321333133313331323123232223222   >>