C1111233131211111211113313331333133313232321333133313231323311221231   >>    C111123313121111121111331333133313331323232133313331323132331122123   <<    C1111233131211111211113313331333133313232321333133313231323311221233   >>      C1111233131211111211113313331333133313232321333133313231323311221232   >>