students using smartphones
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03:18
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03:01
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19:03
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04:39
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18:20
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01:49
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03:18
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03:01
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19:03
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04:39
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18:20
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01:49
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01:34
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03:00
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48:36
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04:29
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20:48
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01:38
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04:23
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26:16
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08:29
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