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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 isPositiveStrand(self):
 """ Check if this genomic region is on the positive strand. :return: True if this element is on the positive strand """

    if self.strand is None and self.DEFAULT_STRAND == self.POSITIVE_STRAND:
      return True
    return self.strand == self.POSITIVE_STRAND