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Judges rated technical elements in Trusova's performance at 92.35 points, which is an unofficial world record.
The Russian figure skater made a quad salchow and a quad toe loop for the first time in history in her free programme.
Alexei Erokhov showed the best result in junior men's skating.
"I cannot remember that we had such a successful performance at the junior figure skating championships before. Nine medals out of twelve is simply a fantastic result," Gorshkov said. "I congratulate our juniors' team, all our athletes and, certainly, their coaches," he added.
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