Looking for a macro or function to concatenate every unique combination

Hi everyone,

I am working on a project where I have 12 adjective keywords (N2:Y2) and 4 noun keywords (J2:M2). I need to concatenate every unique(no repeating words) combination of these two groups so that it looks like:

N J
N K
N L
N O J
N O K
N O L
N O M
etc...

If there is a blank in any of the keyword cells for a combination, I would like the corresponding concatenated cell to be blank as well. I would like to put the first concatenated cell in Z2, keeping all concatenations in the same row.

I've attached a test file below. Any help would be greatly appreciated! Thanks!