C1111233131211111211113313331333133313231121133212331333133313221123321   >>    C111123313121111121111331333133313331323112113321233133313331322112332   <<    C1111233131211111211113313331333133313231121133212331333133313221123323   >>      C1111233131211111211113313331333133313231121133212331333133313221123322   >>