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In this April 1, 2020, photo, a passenger holds up a green pass on their phone on a subway train in Wuhan in central China's Hubei province. Green is the "health code" that says a user is symptom-free and it’s required to board a subway, check into a hotel or just enter Wuhan, the central city of 11 million people where the pandemic began in December. (AP Photo/Olivia Zhang)

In this April 1, 2020, photo, a passenger holds up a green pass on their phone on a subway train in Wuhan in central China's Hubei province. Green is the "health code" that says a user is symptom-free and it’s required to board a subway, check into a hotel or just enter Wuhan, the central city of 11 million people where the pandemic began in December. (AP Photo/Olivia Zhang)

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