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Pennsylvania's new coronavirus exposure-notification app is shown available in an App Store for download on a mobile phone screen, Tuesday, Sept. 22, 2020, in Zelienople, Pa. The release of the app Tuesday is part of Pennsylvania's effort to more quickly break chains of transmission by using the new technology to notify people who may have been exposed. (AP Photo/Keith Srakocic)

Pennsylvania's new coronavirus exposure-notification app is shown available in an App Store for download on a mobile phone screen, Tuesday, Sept. 22, 2020, in Zelienople, Pa. The release of the app Tuesday is part of Pennsylvania's effort to more quickly break chains of transmission by using the new technology to notify people who may have been exposed. (AP Photo/Keith Srakocic)

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