C1111233131211111211113313331333133313331333133311221123222313221   >>    C111123313121111121111331333133313331333133313331122112322231322   <<    C1111233131211111211113313331333133313331333133311221123222313223   >>      C1111233131211111211113313331333133313331333133311221123222313222   >>