beginbegin cannot be detected

I have issue with a value that should have just work, however, it seem to be a bug which I could not understand. Maybe you can find any bug?

Note: I have no issue with the "begin" and "end", just "beginbegin" and "endend" always return false.

My array values:

beginbegin,endend,-,-,-,begin,end,-,-,-,begin,end,-,-,-,-,begin,-,end

My code:

private var xm:int = 0;

            private function createBeam():void {
                for(var a:int=xm;a<naArray.length;a++) {
                    if(beamStatusArray[a]=="begin" || beamStatusArray[a]=="beginbegin") {
                        xm = a;
        trace(beamStatusArray[a]=="beginbegin");  //always return false even there a "beginbegin" in the array
    if(beamStatusArray[a]=="begin" || beamStatusArray[a]=="beginbegin") {
                var getBeam:int = yArray[a]
                for(var aa:int=a;aa<naArray.length;aa++) {
                    if(beamStatusArray[aa]=="end" || beamStatusArray[aa]=开发者_StackOverflow="endend") {
                        break;
                    }
                }
            }
        }
    }

The problem looks like it's with your loop code and not the string comparison. Why is the counter in the outer loop initialized to aa instead of 0?