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FILE - In this Sept. 29, 2015, file photo, Luana poses for photos on her roller skates at her home in Merlo, Argentina. Luana says that when one of the girls asked her why she had a penis, a friend jumped in. "She's transsexual," the child explained, nonchalantly. That level of comfort is no doubt in part because Luana herself appears so at ease. In 2013, she became the youngest person to take advantage of a progressive Argentine law that allows people to identify their own gender for legal purposes. (AP Photo/Natacha Pisarenko, File)