Hash table iteration example
(let ((test (make-hash-table)))
(setf (gethash 'a test) "This is the a value")
(setf (gethash 'b test) "This is the b value")
(maphash #’(lambda (sym str)
(format t "~&~A = ~S" sym str))
B = "This is the b value"
A = "This is the a value"