Need help to Remove duplicate duplicate in same cells leaving distinct values

[dblank1974]

I am new to power BI and the M code.  I need help removing duplicates within a cell but keeping the distinct values.  Below is the sample table I am trying this on.  I already grouped on a single column and extracted the data I wanted;

As you can see from the highlights I only want one test 3 in each of these examples.  Below is the code I am trying with the advanced editor;

There are no syntax errors but when I run it I get the following error

What am I doing wrong?  Any pointers would be greatly appreciated.

[rashidkhanrk06]

Hello there

You should try this 

Table.TransformColumns( Source , {"Plugin Name", each Text.Combine(List.Distinct( Text.Split(_, ",")), ",")})

[dblank1974 · Accepted solution]

well, I guess it only took me to spell out my problem on this forum to see where I was messing up.  I soolved my own problem.  Below was the correct code if anyone is interested.  The highlight is what  changed.