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--- modes/petri.c.orig	2009-08-20 08:05:37.000000000 +0200
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+++ modes/petri.c	2009-08-20 08:05:46.000000000 +0200
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@@ -217,7 +217,7 @@
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    cell *arr;
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    cell *head;
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    cell *tail;
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-   int count;
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+   unsigned int count;
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    Bool originalcolors;
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    GC *coloredGCs;
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    int blastcount;