getSupportedFunctions());
// add NOfFunction
targetFunctions.addAll((new NOfFunctionCluster()).
getSupportedFunctions());
// add NotFunction
targetFunctions.addAll((new NotFunctionCluster()).
getSupportedFunctions());
// add ComparisonFunction
targetFunctions.addAll((new ComparisonFunctionCluster()).
getSupportedFunctions());
// add MatchFunction