Leo joined the line snaking toward a stack of crates. Sergeant Rachel stood at the front, efficiently handing out a large, featureless box to each student. When his turn came, Leo took his and stepped aside, turning it over in his hands. There were no visible seams or latches; he was stumped.
The solution, he eventually discovered, was a fingerprint scanner set flush with the surface, perfectly concealed by a layer of paint. It was the sort of
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