(defun weather-nominal ()
  (let ((yes 10) (no 3))
    `((sunny    hot  high   FALSE ,no) 
      (sunny    hot  high   TRUE  ,no)
      (overcast hot  high   FALSE ,yes)
      (rainy    mild high   FALSE ,yes)
      (rainy    cool normal FALSE ,yes)
      (rainy    cool normal TRUE  ,no)
      (overcast cool normal TRUE  ,yes)
      (sunny    mild high   FALSE ,no)
      (sunny    cool normal FALSE ,yes)
      (rainy    mild normal FALSE ,yes)
      (sunny    mild normal TRUE  ,yes)
      (overcast mild high   TRUE  ,yes)
      (overcast hot  normal FALSE ,yes)
      (rainy    mild high   TRUE  ,no))))