C1111233131211111211113313331333133313331333132213331333133313233232321   >>    C111123313121111121111331333133313331333133313221333133313331323323232   <<    C1111233131211111211113313331333133313331333132213331333133313233232323   >>      C1111233131211111211113313331333133313331333132213331333133313233232322   >>