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In this Wednesday, April 6, 2016 photo provided by Busan Metropolitan City, a woman sits on special priority seats next to a metal bar attached with a "pink light" wireless sensor in a subway train in Busan, South Korea. South Korea's second-largest city of Busan is testing a wireless technology it hopes can alleviate such problems and perhaps help address one of the biggest challenges facing the Asian country: a stubbornly low birthrate. (Kwon Sung-hoon/Busan Metropolitan City via AP)

In this Wednesday, April 6, 2016 photo provided by Busan Metropolitan City, a woman sits on special priority seats next to a metal bar attached with a "pink light" wireless sensor in a subway train in Busan, South Korea. South Korea's second-largest city of Busan is testing a wireless technology it hopes can alleviate such problems and perhaps help address one of the biggest challenges facing the Asian country: a stubbornly low birthrate. (Kwon Sung-hoon/Busan Metropolitan City via AP)

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