  1 ) What procedure can you use as the first argument to every so that for any sentence
     used as the second argument , every returns that sentence ?
;
  2 ) What procedure can you use as the first argument to keep so that for any sentence used
     as the second argument , keep returns that sentence ?
;
  3 ) What procedure can you use as the first argument to accumulate so that for any
     sentence used as the second argument , accumulate returns that sentence ?


  1
; You can use the the procedure 'word'.
(every word '(this is a sentence))

  2
; You could provide a procedure that always returns true.
(keep (lambda (n) #t) '(this is a sentence))

  3
; You could use the procedure 'sentence'.
(accumulate sentence '(this is a sentence))



 You can use the the procedure 'word'.
 You could provide a procedure that always returns true.
 You could use the procedure 'sentence'.
  1 ) What procedure can you use as the first argument to every so that for any sentence
     used as the second argument , every returns that sentence ?
  2 ) What procedure can you use as the first argument to keep so that for any sentence used
     as the second argument , keep returns that sentence ?
  3 ) What procedure can you use as the first argument to accumulate so that for any
     sentence used as the second argument , accumulate returns that sentence ?


  1
(every word '(this is a sentence))

  2
(keep (lambda (n) #t) '(this is a sentence))

  3
(accumulate sentence '(this is a sentence))
