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when did superheroes first appear
when were superheroes invented
what was the first superhero ever created
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what was the first superhero
the history of superheroes
who was the first superhero ever made
who created the first superhero
when did superheroes first appear, when were superheroes invented, what was the first superhero ever created, first superhero in history, what was the first superhero, the history of superheroes, who was the first superhero ever made, who created the first superhero
