From: Andrea Asperti <andrea.asperti@unibo.it>
Date: Thu, 23 Dec 2010 12:13:32 +0000 (+0000)
Subject: Avoid duplicates in the list.
X-Git-Tag: make_still_working~2624
X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=commitdiff_plain;h=af73dd5916c5505e8285766f0e3a48a8693943ef;hp=af73dd5916c5505e8285766f0e3a48a8693943ef;p=helm.git

Avoid duplicates in the list.
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