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2 points by kennytilton 6144 days ago | link | parent

Puzzled. Do you mean the nils would arise because non-nil entries would be changed to nil as they were (somehow) processed? Just delete the cons:

   (= (cdr prior-kill-me) (cdr kill-me))
instead of:

   (= (car kill-me) nil)
Otherwise you are forever iterating over the now irrelevant cons,