Question: Return the function that finds the difference from num. #'(lambda (x) (abs (- x num)))) (defun sorter (cost-fn) Return a combiner function t h a
"Return the function that finds the difference from num."
#'(lambda (x) (abs (- x num))))
(defun sorter (cost-fn)
"Return a combiner function t h a t sorts according to cost-fn."
#'(lambda (new old)
(sort (append new old) #'< :key cost-fn)))
(defun best-first-search ( s t a r t goal-p successors cost-fn)
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