問3
> (equal? '(this is a list) '(this is a list))
#t
> (equal? '(this is a list) '(this (is a) list))
#f
> (equal? '(this (is (a)) list) '(this (is (a)) list))
#t
> (equal? '(this (is (a)) list) '(this (is (b)) list))
#f

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