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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_timestamp(timezone_name, year, month, day, hour=0, minute=0):
 """Epoch timestamp from timezone, year, month, day, hour and minute."""

    tz = pytz.timezone(timezone_name)
    tz_datetime = tz.localize(datetime(year, month, day, hour, minute))
    timestamp = calendar.timegm(tz_datetime.utctimetuple())
    return timestamp