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Vintage WFF \'N PROOF Equations Game by Layman E. Allen Boxed Set 1967:
$25.00
Vintage Equations \"Games for Thinkers\" by WFF \'N PROOFCreated by Yale University law professor Layman E. Allen in the 1960s.Includes complete set, box, instructions, playing mat and 24 cubes with digits and operation signs (+, -, ×, ÷, exponents).
