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July 17, 2018

July 2018 Puzzle Periodical - Marble Math

NSA Puzzle Periodical for July 2018: Marble Math

May 15, 2018

May 2018 Puzzle Periodical - Shall We Play a Game? Computer Tic-Tac-Toe

NSA Puzzle Periodical for May 2018: Computer Tic-Tac-Toe