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Reroll based on total of dice

I know how to reroll if individual dice match a certain criteria, but how do you do this based on the sum of several dice? For example, roll 3d6 and reroll any result that is 7 or less?
It appears that the only way to do this is to create a roll table with normal 3d6 probabilities for results 8-18 and zero probability to get 3-7.
1607212257
Oosh
Sheet Author
API Scripter
Yeah, the grouped roll trick doesn't work for rerolls unfortunately.