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Trials and tribulations en pointe: director-cinematographer Bertrand Normand’s hardy “Ballerina” is a portrait of five premier ballerinas from Russia’s Mariinski Theatre, formerly known as the Kirov. A process documentary in the best sense of the practice, capturing rehearsals, interviews and bits of performance, “Ballerina” captures the rigor and strength required to make effortless-seeming art. Diane Baker narrates. 77m. DigiBeta. (Ray Pride)