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So how is all this information actually used?

`print`constructs a directed graph that says what conversions are possibleIt knows where it starts and where it wants to go (PCL)

It does breadth-first search on the graph to find a conversion path

The graph is represented as a hash:

{ email => ["latex"], pod => ["3"], pl => ["txt", "ps"], txt => ["ps"], dvi => ["ps", "pcl"], ps => ["pcl"], ... }

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