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The Three X's were a team of adventurers from the 1940's who worked as private detectives. 1X was a detective and ciminologist, 2X was a "walking encyclopedia" and 3X was a skilled hand-to-hand fighter.
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Mystic Comics (1940)
Official Handbook of the Marvel Universe A to Z (2008)
HC vol. 12 - 'Tara to Vision'
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