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Sequence copy



Also, Taylor proposed a modification to *-copy on sequences, similar to 
the following:

procedure: *-copy sequence [start [count]] => %

Copies the sequence to a newly allocated structure, optionally
from a given starting indice, and proceeding for count elements.


This allows one to efficiently obtain subsequences of another sequence, 
while remaining agnostic of the particular sequence type.  

	Scott
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