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I'm not sure when/if I'll have time to give this puzzle the time and effort it deserves, but I do love seeing 23| and 31| as clues. My first thought on the 31| was that it had to be 15,16. But I was thinking too small! That's only true tor a 16x16 puzzle. Expand that to 20x20 and the possibilities increase a great deal.
I am not sure anybody will have the time to solve this puzzle.
I made the same mistake with the 31|, it took a while to get used to thinking in numbers up to 20.