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[plt-scheme] Combinations

From: Iain Gray (iaingray at ednet.co.uk)
Date: Fri Jun 3 03:29:50 EDT 2005		 
Does anyone know of an efficient way of generating the combinations of 
k  objects from n objects? I could generate permutations and then 
filter out on set equality, but my example is largish in choosing 4 
from 70.

Any advice would be appreciated.

Iain
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