public HashSet getCompleteLambdaSet(Grammar grammar) {
		HashSet lambdaSet = getNewLambdaSet();
		while (areMoreVariablesToAddToLambdaSet(grammar, lambdaSet)) {
			String variable = getNewVariableThatBelongsInLambdaSet(grammar,
					lambdaSet);
			addVariableToLambdaSet(variable, lambdaSet);
		}
		return lambdaSet;
	}