CFGLib.CFGtoCNF.StepDel C# (CSharp) Method

		private void StepDel(ISet<Production> productions) {
			var nullableProbabilities = GrammarHelpers.GetNullable(productions);
			var newRules = new List<Production>();
			foreach (var production in productions) {
				var toAdd = Nullate(production, nullableProbabilities);
				RemoveExtraneousNulls(toAdd);
				newRules.AddRange(toAdd);
			}
			productions.Clear();
			productions.UnionWith(newRules);
		}