public boolean processMatch(ValueEval eval) {if(result == null) {result = eval;}else {if(result instanceof BlankEval) {result = eval;}else {if(!(eval instanceof BlankEval)) {result = ErrorEval.NUM_ERROR;return false;}}}return true;}
public bool ProcessMatch(ValueEval eval){if (result == null) {result = eval;}else {result = ErrorEval.NUM_ERROR;return false;}return true;}