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In this paper, we study the step-wise tile assembly model introduced by Reif (in: Based computers III, vol 48 of DIMACS, 1999) in which shape is assembled in multiple steps. In each step the partially built structure is exposed to a new set of tiles. We show that an N × N square can be assembled in N steps using a constant number of tile types. In general, we show that a constant number of tile types...
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