public boolean isFour() {
	boolean retBoo = false;
	if (isTrip()) {
	    for (int i = 0; i < _cards.size()-3; i++) {
		for (int x = (i+1); x < _cards.size()-2; x++) {
		    if (_cards.get(i).compareTo(_cards.get(x)) == 0) {
			for (int p = (x+1); p < _cards.size()-1; p++) {
			    if (_cards.get(i).compareTo(_cards.get(p)) == 0) {
			        for (int q = (p+1); q < _cards.size(); q++) {
				    if (_cards.get(i).compareTo(_cards.get(q)) == 0)
					retBoo = true;
				}
			    }
			}
		    }
		}
	    }
	}
	return retBoo;
    }