Recognizer for a true list of pairs whose cdrs are suitable for eql
The predicate
Function:
(defun r-eqlable-alistp (x) (declare (xargs :guard t)) (cond ((atom x) (equal x nil)) (t (and (consp (car x)) (eqlablep (cdr (car x))) (r-eqlable-alistp (cdr x))))))