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This software may only be used by you under license from AT&T Corp.
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("AT&T"). A copy of AT&T's Source Code Agreement is available at
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AT&T's Internet website having the URL:
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<http://www.research.att.com/sw/tools/graphviz/license/source.html>
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If you received this software without first entering into a license
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with AT&T, you have an infringing copy of this software and cannot use
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it without violating AT&T's intellectual property rights.
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/* Sites are also used as vertices on line segments */
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extern Site *bottomsite;
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extern void siteinit();
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extern Site * getsite ();
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extern float dist(Site*, Site*); /* Distance between two sites */
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extern void deref(Site*); /* Increment refcnt of site */
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extern void ref(Site*); /* Decrement refcnt of site */
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extern void makevertex(Site*); /* Transform a site into a vertex */