(idea) by washort Tue Apr 18 2000 at 4:04:09
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A special case of the cond can be compressed into a case expression. This is when every test is a membership test.

(case c
  ((#\a) 1)
  ((#\b) 2)
  ((#\c) 3)
  (else 4))
=> 3

The clause whose head contains the value of c is chosen.

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