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What is the difference between the Pre-Crisis version of Superman and Post-Crisis version of Superman? How did the Crisis affect the DC Universe? - Quora

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What is the difference between the Pre-Crisis version of Superman and Post-Crisis version of Superman? How did the Crisis affect the DC Universe? - Quora

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What was the purpose of the “Crisis on Infinite Earth” event in DC comics? How did it affect future events for Superman and other characters in the DC universe? - Quora