
<div class="fragment"><pre class="comment"> prufer --- convert a tree to/from its Prufer code
 output = prufer(g) returns the Prufer code for g (assuming g is a tree)
 prufer(g,code) overwrites g with a tree based on the code 

 The Prufer code is a way to map bijectively trees on n vertices 
 into n-2 long sequences of integers drawn from [n].</pre></div>

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