Remove Duplicate Values from Calculated Column Result

[nsexton12]

I have a calculated column that is using the values in a response column, searching it for keywords, and returning the values associated with those keywords from another table. The problem I am running into is that there are duplicates because there is overlap between keywords. For example: 

Problem

car emissions through use of fossil fuels are harming the environment

Keyword	Solution
car emissions	use less cars
fossil fuels	use less cars

I am using the function in a calculated column in the problem table. 

CONCATENATEX('Solutions Table',IF(SEARCH('Solutions Table'[Keyword],'Problem Table'[Problem],,999) <> 999,'Solutions Table'[Solution] &"; ",""))

This works great until I have an example like above. I would like it to only return "use less cars" instead of "use less cars; use less cars". I have tried everything I know how to do to get the duplicates to go away but cannot find any solution. Could someone please help me out? 

[ryan_mayu]

@nsexton12 

maybe you can try this in PQ. However, we still need to text.combine if one problem has different solutions.