C1111233131211111211113313331333133313221211113313331333133313233212121   >>    C111123313121111121111331333133313331322121111331333133313331323321212   <<    C1111233131211111211113313331333133313221211113313331333133313233212123   >>      C1111233131211111211113313331333133313221211113313331333133313233212122   >>