Matrix into a list with prior filter

Hi everyone,

I was wondering if you think there is a possibility to filter out a matrix so than there are no repetitions of numbers inside it. And in the end you can output the resulting list.

I tried using jit.spill and zl list processing but the list would be to big and thus hard to process.

I was thinking if there is a solution so that this could be done inside the matrix.

What do you think?