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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_range_string(self):
 """ get the range string represetation. similar to the default input for UCSC genome browser :return: representation by string like chr2:801-900 :rtype: string """

    return self.chr+":"+str(self.start)+"-"+str(self.end)