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Participants try to solve Rubik's Cube at the 2019 Osijek Open speedcubing competition in Osijek, Croatia, on Feb. 24, 2019. (Xinhua/Dubravka Petric)

Participants try to solve Rubik's Cube at the 2019 Osijek Open speedcubing competition in Osijek, Croatia, on Feb. 24, 2019. (Xinhua/Dubravka Petric)