Input: {a,a,b,c,d,d,e} Required Output: {a,b,c,d} Is there any e

Required Output: {a,b,c,d,e}
Unique ones.

Hi,
Following expression will help you in this case
union({a,a,b,c,d,d,e},{a,a,b,c,d,d,e}).

I also use the Union method - however since I needed to remove duplicates in several different places, i wrote a custom expression rule which takes one input (array) and passes out the same array with duplicates removed. The internals of the expression rule is just the aforementioned Union(), though it could theoretically be replaced with something else in the future.

Thanks.