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Re: Atoms in association lists

1) Version 2.2, LM performs as I stated.  I don't have 2.4.  Personally,
I prefer this performance.

2) CLtL, p.281, "if NIL appears in the a-list in place of a pair ... ASSOC 
will ignore the NIL in the a-list and continue to search for an actual 
pair (cons) whose car is NIL."

If 2.4 returns NIL, then it is a bug.