public ZemObject get(ZemObject index){
		int ind = -1;
		if(! (index instanceof ZemNumber)){
			return null;
		}
		ind = ((ZemNumber)index).intValue();
		if(ind < 0 || ind >= elements.size()){
			return null;
		}
		Iterator<ZemObject> iter = elements.iterator();
		while(ind > 0){
			if(iter.hasNext()){
				iter.next();
			}
			ind--;
		}
		return iter.next();
	}