For example, the user before access to do a questionnaire survey, then can according to user's fill in the content of personal delivery,
For example in the nutrition care, by him to do the questionnaire through his work and rest time recommend to the product of the related aspects such as what melatonin similarly,

Now suppose already exists such a questionnaire, and different products, what kind of algorithm or method for users to realize personal custom?

Can recommend posts, documents, books, etc., trouble you Daniel,

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