> 
> I don't find this confusing. In fact I find the implicit
> application of
> uniq (older version) more confusing because it is somewhat
> surprising - at
> least to me.  In that case substraction indeed combines two
> operations.
> 
> I'd view the substraction "a-b" as "remove all elements in b from
> a",
> which would reasonable lead to all 2's removed from [1,1,2,2,2]
> yielding
> [1,1].


So [1, 1, 2, 2] - [2] should yield the same as [1, 1, 2, 2] - [2, 2]?
 That seems odd to me.


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