2.1.4.5.1 Examples of Multiple Escape Characters

 ;; The following examples assume the readtable case of *readtable* 
 ;; and *print-case* are both :upcase.
 (eq 'abc 'ABC) =>  true
 (eq 'abc '|ABC|) =>  true
 (eq 'abc 'a|B|c) =>  true
 (eq 'abc '|abc|) =>  false