Or maybe just scaling the lower bound: 1-21,10-31,100-121,1000-1021
Or scaling the lower bound faster (still preventing overlap): 1-21,22-100,101-210,1000-2100
If I understand the second one, there should be a 211-1000. That seems fun, too. The first option seems lame.
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Yeah, I messed that one up. The case where the upper bound is larger than 10x the lower bound is weird.
I like the randomness increasing slightly slower though.
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