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Catherine Killeen and her friends are all composites based on the many brilliant, fascinating female codebreakers working at Arlington Hall, including women like Angeline Nanni, Gloria Forbes, Mildred Hayes, Carrie Berry, Mary Boake, Josephine Miller Deafenbaugh, Joan Malone Callahan, Helen Bradley, Juanita McCutcheon, Ruby Roland, and Gene Grabeel.
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