Gretta stood in position by the conveyor belt and readied herself to grab the next cardboard box that reached her. She snatched it and pulled it toward her so it rested partially on the metal shoulder that ran along the belt. Inside the box, an eclectic collection of purchased items sat beneath a printout of the customer’s order. Gretta rummaged through the items—with care—to ensure everything paid for had been inserted by a picker.

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