what marks the beginning of the common era
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what marks the beginning of the common era
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what started the common era
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when does the common era start
what was before the common era
when was the common era started
what year was the common era
the common era began at which event
what is common era in history
what marks the beginning of the common era, start of the common era, what started the common era, when does the common era begin, what year did the common era begin, when does the common era start, what was before the common era, when was the common era started, what year was the common era, the common era began at which event, what is common era in history
