Before revision:  The 2HAM systems we give in this paper are the first examples of systems that strictly self-assemble discrete self-similar fractals at scale factor 1 in a purely growth model of self-assembly.
After revision:  The 2HAM systems we give in this paper are the first examples of systems that finitely self-assemble discrete self-similar fractals at scale factor 1 in a purely growth model of self-assembly.