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March 20, 2018

March 2018 Puzzle Periodical - a, b, c - Variable Alphabet Equation

March 2018 NSA Puzzle Periodical - a, b, c - Variable Alphabet Equation by Wendell W.

March 21, 2017

March 2017 Puzzle Periodical - Lucky Seven

March 2017 Puzzle Periodical - Lucky Seven; Puzzle created by David G., NSA Mathematician