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Old 11-17-2019, 01:20 PM
markn+ is offline
Join Date: Feb 2015
Location: unknown; Speed: exactly 0
Posts: 3,002
Probably not what you want, but I just wrote a quick 15-line Perl script to search all 900*900 possibilities. Took me about 2 minutes.

Nitpick: there's a typo in one of the numbers in the first line of your spoiler.