C1111233131211111211113313331333133313331322331333133313233231211   >>    C111123313121111121111331333133313331333132233133313331323323121   <<    C1111233131211111211113313331333133313331322331333133313233231213   >>      C1111233131211111211113313331333133313331322331333133313233231212   >>