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Benjamin, A. T. (2009). $\textit{Discrete Mathematics}$. Chantilly, Virginia: The Great Courses.  Mendelsohn, N. S. (2004), "Tiling with dominoes", The College Mathematics Journal  Parity of Integers. $\textit{Brilliant.org.}$ Retrieved 20:29, March 31, 2016, from https://brilliant.org/wiki/modular-arithmetic-parity/