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Top 10 most difficult in DB

IdnrStarting numbersDifficulty
15579100 (Super easy)
15578120 (Very easy)
15577100 (Super easy)
15576120 (Super easy)
15575120 (Super easy)
15574120 (Super easy)
15573120 (Super easy)
15572100 (Super easy)
15571120 (Super easy)
15570120 (Very easy)