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abortisco l'ultima transazione
<prompt>$</prompt> <userinput>hg tip</userinput>
changeset:   0:ce49f5b59f20
tag:         tip
user:        Bryan O'Sullivan &lt;bos@serpentine.com&gt;
date:        Fri Jun 05 15:51:13 2009 +0000
summary:     Primo commit.

<prompt>$</prompt> <userinput>hg status</userinput>
M a
? b
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