At 2:00 PM, a thermometer reading 80°F is taken outside, where the air temperature is 20°F. At 2:03 PM, the temperature reading yielded by the thermometer is 42ºF. Later, the thermometer is brought inside, where the air is 80°F. At 2:10 PM, the reading is 71°F. When was the thermometer brought indoors?

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