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What do the following calls to FOO return?
FOO
(defun foo (x y) (cond ((eql x '*) t) ((atom x) (eql x y)) ((atom y) nil) ((foo (car x) (car y)) (foo (cdr x) (cdr y))) (t nil)))
(foo '* 'a)
(foo '(*) '(a b))
(foo '(* *) '(a b))
(foo '(*) '((a b)))
(foo '* '())
(foo '(*) '())
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