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Jan 19th, 2019
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  1. valid_date(x,y,z):
  2. y = (x > 31 or y > 31 or z > 31)
  3. m = (x <= 12 or y <= 12 or z <= 12)
  4. d = (x >= 19 or y >= 19 or z >= 19) # cant remember why 19?
  5.  
  6. return (y and m and d)
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