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Another vote for big/big method that snotty mentioned last page, specifically:
The correct way is big/big not through the derailleur plus a pair of links on top of the shortest you could make it, from there you usually add another pair for 1x and another for suspension.
I worked with a very skilled race mechanic who told me this was the standard Shimano method. Also happens to be the Sheldon Brown method IIRC.
Ndeipi
snottyotter
Size it big/big plus enough to take up the derailleur as mentioned and you can accidentally go big/big without exploding your drivechain when you forget what gear you're in going up a hill, if there's a bit of slack when you accidentally go small/small you won't break anything.