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In page Cyd Charisse:

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She was a sickly girl who started dancing lessons at six to build up her strength after a bout of polio. At 12, she studied ballet in Los Angeles with Adolph Bolm and Bronislava Nijinska, and at 14, she auditioned for and subsequently danced in the Ballet Russe de Monte-Carlo as "Felia Siderova"[5][6] and, later, "Maria Istomina".[6]