> 
> al
((1 . 1) (3 . 9) (5 . 25))
> (assoc 1 al)
(1 . 1)
> (assoc 1 al)
> (assoc 1 al)
(1 . 1)
> (del-assoc 3 al)
((1 . 1) (5 . 25))
> (del-assoc 3 al)
((1 . 1) (5 . 25))
> (del-assoc 2 al)
((1 . 1) (3 . 9) (5 . 25))
> (add-assoc 3 10 al)
((3 . 10) (1 . 1) (5 . 25))
> (search 
> (exists? odd? '(1 2 34))
#t
> (exists? odd? '(0 2 34))
#f
> (search odd? '(1 2 34))
#t
> (search odd? '(0 2 34))
#f
> (search 
> (all? odd? '(1 3 5))
#t
> (all? odd? '(1 3 6))
#f