Workaround CLISP bug
CLISP does not recognize that an uninterned symbol in different parts of a progn is the same; http://sourceforge.net/tracker/?func=detail&aid=836838&group_id=1355&atid=101355 Since this bug was "long-standing" the better part of a decade ago, we will assume it now has tenure and change the progn to let.
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