Green Tiles (Correct Letter, Correct Position): This is a confirmed product on the right shelf! You’ve found a specific item your customer needs, and it’s exactly where it should be. This is invaluable information.
Yellow Tiles (Correct Letter, Wrong Position): This is a product you do have, but it’s misplaced. You know it’s in your store, but you need to move it to the correct department. It's a clue, but requires further action.
Gray Tiles (Incorrect Letter): This is an item you definitively don't carry. You can immediately remove it from your mental inventory. This is also crucial information, allowing you to narrow down your search.