[racket] Challenge: Game of life in 140 chars

From: Gary Baumgartner (gfb at cs.toronto.edu)
Date: Fri Feb 17 21:31:04 EST 2012

Depending on taste, the live/die rule:
  (if (<= n 3 (+ n C)) 1 0)
  (if (<= 0 (- 3 n) C) 1 0)

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