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Just to confirm that I understood correctly, 'helpful to' is not used to indicate purpose? Because I think I read somewhere that to-infinitive is used to indicate purpose.
"To" is used in hundreds of idioms, and it's also part of the infinitive form of all verbs ("to eat", "to be", etc.). So you definitely wouldn't want to overgeneralize and say that "to" always indicates purpose. And don't overthink "helpful to" -- it's very unlikely that you'll
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