Regarding finding the number of unique elements in a list.

Jeffrey R Lewis
Thu, 17 Jan 2002 16:09:40 -0800

On Thursday 17 January 2002 03:31 pm, Tom Bevan wrote:
> I consider myself a newbie too but here are my solutions

FWIW, at a glance, those are identical, or very similar to, the following 
standard functions:

contains  -->  elem
unique -->  nub  (you'll need to import List)
innerList  -->  concat