C1111233131211111211113313331333133313331333133313331333133313222332211   >>    C111123313121111121111331333133313331333133313331333133313331322233221   <<    C1111233131211111211113313331333133313331333133313331333133313222332213   >>      C1111233131211111211113313331333133313331333133313331333133313222332212   >>