adverb
modifies a verb, adjective, or other adverb, indicating manner, time, place, or degree
preposition
shows the relationship between a noun (or pronoun) and other words in a sentence
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The rules must be followed according to Hoyle in order to maintain order in the organization.
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We have to do it according to Hoyle or else we'll get in trouble.
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Do it the right way, according to Hoyle, or don't do it at all.
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She always plays by the rules, according to Hoyle, even in difficult situations.