public boolean isPair(int id1, int id2) {
		Integer integer = pairs.get(id1);
		if (integer == null) {
			// TODO Report this bug!!!
			return false;
		}
		return integer.equals(id2);
	}
@param id
           The id is the number between 0 and number of possible tiles of
           this theme
@return The Bitmap of the tile
subs/game/src/main/java/com/snatik/matches/model/BoardArrangment.java