public void addAll(TileSet aTiles)
	{
		if (mProbability)
		{
			final byte nothing = mField.getMasks().getNothing().getId();
			for (int tile : aTiles)
				mTiles.put(tile, mField.getMask(tile) == nothing);
		}
		else for (int tile : aTiles)
			mTiles.put(tile, false);
	}