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when were superheroes invented
when did superheroes first appear
when was the first superhero made
what was the first superhero ever created
who created the first superhero
who invented super heroes
first superhero in history
what was the first superhero concept
superhero created in 1962
superhero created in 1941
when were superheroes invented, when did superheroes first appear, when was the first superhero made, what was the first superhero ever created, who created the first superhero, who invented super heroes, first superhero in history, what was the first superhero concept, superhero created in 1962, superhero created in 1941
