Question: Pick multiple non-repeated numbers from a set with gene-pool

Good afternoon
Could you please help me with this specific issue?
What I want to do is this:
I have a list with 1488 grid curves
I want to select 75% of them to generate new boxes and plug these boxes into the Octopus
Since I am using Octopus, I think randomly reduce boxes is not a good choice, so I want to use a gene pool to select these boxes
However, by using a gene pool, it’s very likely that the grasshopper would select the same grid for multiple times.
Therefore, could you please let me know if there is a way I can pick multiple non-repeated numbers from a set with gene-pool?
Thank you