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helpful
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pomocny, użyteczny
I hope my notes will be helpful in your research.
Your advice was helpful, thank you.
You're very helpful, thank you.
It was a helpful advice, I appreciate it.
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pomocny (o osobie)
She has always been a very helpful person.
You were very helpful, I wouldn't do it on my own.
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assistant
I would be grateful if you gave me some assistant look into this.
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good
,
gude
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supportive
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assistive
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facilitative