lookup Ligature1 {
  lookupflags RightToLeft;

  sub "lam-arab.init" "alef-arab" -> "lamalef-arab.isol";
  sub "lam-arab.init" "alefhamzaabove-arab" -> "lamalefhamzaabove-arab.isol";
  sub "lam-arab.init" "alefmaddaabove-arab" -> "lamalefmaddaabove-arab.isol";
  sub "lam-arab.init" "alefhamzaabelow-arab" -> "lamalefhamzabelow-arab.isol";
}