Which of these sentences is punctuated correctly?
although the concert doesn't start for over an hour; most of the fans have already arrived at the concert hall.
the concert doesn't start for over an hour; though, most of the fans have already arrived at the concert hall.
most of the fans have already arrived at the concert hall; however, the concert doesn't start for over an hour.
even though the concert doesn't start for over an hour; however, most of the fans have already arrived at the concert hall
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