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When used as an adjective, is it step by step or step-by-step?

Example,

Thank you for this step by step guide.

or

Thank you for this step-by-step guide.

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up vote 6 down vote accepted

According to Wiktionary, step by step is the adverbial form, whereas step-by-step is the adjectivial. So your second example is the correct one.

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