C1111233131211111211113313331333133313331333133311221123133313231   >>    C111123313121111121111331333133313331333133313331122112313331323   <<    C1111233131211111211113313331333133313331333133311221123133313233   >>      C1111233131211111211113313331333133313331333133311221123133313232   >>