How to git find the subtree when we use the supra merge strategy?

How to git find a subtree when we use a subtree merge strategy? I find only one mention here : β€œIt actually guesses the subtrees you want to combine. Usually this magically turns out to be correct, but if your subtree contains a lot of changes (or was originally empty, or something else), then it can fail effectively. " How does he guess and what can I do if this fails? Something changed after aug'09 when this answer was written?

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