Get distinct values from multiple non contiguous columns and place them in columns

I have a worksheet with about 25 columns. Every other column up to column N has a list of values 9 rows deep.

I want to get the distinct values from those first non contiguous columns and put them into the last three columns.

Formula:

Please Login or Register  to view this content.

I have this so far. Problem lies when switching to the next column of those last three.

Any help?