Fractals tile one another (each by copies of some tile of a fixed size) vs. not so (fractals are tiled by some other combination of one another and themselves).
Fractals tile one another (using copies of one tile of the same size) vs. not so (fractals are tiled by some other combination of one another and themselves).
Fractals tile one another (using copies of one tile of the same size) vs. not so: fractals are tiled by a some other combination of one another and themselves.