Take any 10 dice and say they sum to n. Flip them; now they sum to 70 – n (b/c sum of opposite sides is 7 and there are 10 dice). These make the first pile. The remaining 20 dice make the second pile, which also sums to 70-n (b/c the total was originally 70).

]]>*Three Power Laws for the Physicists, mathematics in thrall,
Four for the biologists, species and all,
Eighteen behavioral, our will carved in stone,
One for the Dark Lord on his dark throne.*

*In the Land of Science where Power Laws lie,
One Paper to rule them all, One Paper to find them,
One Paper to bring them all and in their moments bind them,
In the Land of Science, where Power Laws lie.*

Something about my paper having the current most mentions of “power law” in it, of all the power-law articles on the arxiv, fills me with satisfaction.

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