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The final bit of code we need is that for performing a compression. The following code performs a compression consisting of count applications of the compression transformation starting at root:
/* Performs a compression transformation count times,
The operation of compress() should be obvious, given the discussion earlier. See section 18.104.22.168 General Trees, above, for a review.
See also: [ Stout 1986], vine_to_tree procedure.
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