public static Tile CONCRETE() {
		
		if (random.nextInt(100) == 0) {
			return WASTELAND_GROUND1;
		} else if (random.nextInt(100) == 0) {
			return WASTELAND_GROUND2;
		} else if (random.nextInt(100) == 0) {
			return WASTELAND_GROUND3;
		} else if (random.nextInt(100) == 0) {
			return WASTELAND_GROUND4;
		} else if (random.nextInt(100) == 0) {
			return WASTELAND_GROUND7;
		} else if (random.nextInt(100) == 0) {
			return WASTELAND_GROUND6;
		} else {
			return WASTELAND_GROUND5;
		}
	}