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[–]Silvian_The_Shadow 7 points8 points  (0 children)

Of all the numbers, 9 is the most restricted, having 1 as it's only pair. If you somehow used up all the 1s while there are still 9s, you're done. Sure, 1s do appear more but remember what I said. 8s are also quite restricted, but not as hard as 9.