C1111233131211111211113313331333133313232313331333133313112331231212321   >>    C111123313121111121111331333133313331323231333133313331311233123121232   <<    C1111233131211111211113313331333133313232313331333133313112331231212323   >>      C1111233131211111211113313331333133313232313331333133313112331231212322   >>