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| HARRISON HILLEY PHOTO Sisters on stage Actress and playwright Susan Courtney, left, as artist Mary Cassatt, and Polly Schlitz, as her sister Lydia Cassatt, rehearse before last weekend’s performance at the Tubac Center of the Arts of Courtney’s play “Girl in the Blue Armchair,” about the American artist Mary Cassatt (1844-1926), which takes its title from her famous oil painting now in the National Gallery of Art, Washington, D.C. |