Before he goes to the supermarket, Stanley imagines the items that he needs by thinking about them in their various locations in the store. That way he can get everything he needs in one area before moving on to the next. Stanley is using a mnemonic called

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The method of loci is a mnemonic device that involves visualizing items to be remembered in specific locations, which is what Stanley is doing by imagining the items in their store locations.

Before He Goes to the Supermarket, Stanley Imagines the Items