AIMA.Core.Logic.Propositional.Visitors.SymbolClassifier.getPureSymbolsIn C# (CSharp) Method

        public List<Symbol> getPureSymbolsIn(Sentence sentence)
        {
            List<Symbol> allPureNegatives = getPureNegativeSymbolsIn(sentence);
            List<Symbol> allPurePositives = getPurePositiveSymbolsIn(sentence);
            return SetOps.union(allPurePositives, allPureNegatives);
        }