<pre>Hello everyone,<br>I have to build a new module for GRASS, but I have some doubts about what the things I have to do.<br><br>First of all, i'd need some data structure like graphs, union finds and dynamic trees. Are these structure included in GRASS? <br><br>For a beginner like me a guide that explains the building of a module (or a pattern) would be very very helpful. Could you suggest me something to ease my work?<br><br>Best regards,<br>Roberto</pre><p> 
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