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Given a commutative ring R, the zero-divisor graph of R is an undirected simple graph with vertices the nonzero zero-divisors of R, and two distinct vertices x and y are adjacent if and only if xy = 0. In [8], Redmond presented different versions of zero-divisor graphs of noncommutative rings. The main aim of this paper is to analyse these graphs for the semigroup SPn of all strictly partial transformations on the set Xn = {1, 2, . . ., n}. [ABSTRACT FROM AUTHOR]