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... to the factory yard was locked. The iron railings, chains, and padlocks on the door were all rusted.
Qi Youxuan looked at the padlock without touching it, then pointed and said, “These padlocks were opened recently and frequently by someone. There’s rust between the chains.”
Qi Youxuan removed his handkerchief from his trouser pocket and gently wiped between the chains. Sure enough, the handkerchief was stained with a brownish powdery substance.
“However, the padlock is clean, ...
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