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Austria's twins Anna-Maria Alexandri and Eirini Alexandri compete during the duet technical routine at the FINA Artistic Swimming World Series Budapest Open in Budapest, Hungary on May 18, 2018. (Xinhua/Attila Volgyi)

Austria's twins Anna-Maria Alexandri and Eirini Alexandri compete during the duet technical routine at the FINA Artistic Swimming World Series Budapest Open in Budapest, Hungary on May 18, 2018. (Xinhua/Attila Volgyi)