C1111233131211111211113313331333133313331333133311221123232212131   >>    C111123313121111121111331333133313331333133313331122112323221213   <<    C1111233131211111211113313331333133313331333133311221123232212133   >>      C1111233131211111211113313331333133313331333133311221123232212132   >>