Hi Neil! :-)

 NH> True.  In thinking about that problem the only way (that I can see) 
 NH> to overcome it would be to dynamically create an array based on the size 
 NH> of the input data set OR do a linked list thing.
You'd still need to tell the user how big your newly created array is.
After all, it's very likely the dupes were not removed for fun, so the
output array will be used again in the future.

Ciao
Pascal

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