Type into google search “best (insert product) for.

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Then look at the google auto suggest. People often want to buy a product to fulfill a solution. So they search things like best product for “solution they want solved”

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You can go through the entire alphabet to see different solutions to the product people search.

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Ex: Best shoes for a

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EX: Best shoes for b

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This can give you a better feel for the types of solutions people are looking for in your products and potential opportunities to add to a PPC campaign.