From ...
From: Erik Naggum <erik@naggum.no>
Subject: Re: format directive "~{...~}"
Date: 2000/01/11
Message-ID: <3156569413180279@naggum.no>#1/1
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* Shin <fxn@retemail.es>
| USER(1): (format nil "(~{~a~^,~% ~}))" (list 'one 'two 'three))
| "(ONE,
|  TWO,
|  THREE))"

  for this to work, you would need to do ~& first, and it will fail to
  produce the correct output if any forms are nested.  using the
  pretty-printer interface will work in such cases.

#:Erik