code: def is_subset(self1):
        
        if len(self1.overs) == 0: return False
        if len(self1.dif1) > 0: # make sure they are consecutive if more than one
          if max(self1.dif1) != 1 or max(self1.dif2) != 1: return False
        onecov = self1.start1 and self1.end1
        twocov = self1.start2 and self1.end2
        if onecov and twocov:
          return 1
        elif twocov: return 2
        elif onecov: return 3
        return False
docs: Return value if tx_obj2 is a complete subset of tx_obj1 or 
            tx_obj1 is a complete subset of tx_obj2
  
            Values are:
  
            * Return 1: Full overlap (mutual subests) 
            * Return 2: two is a subset of one
            * Return 3: one is a subset of two
            * Return False if neither is a subset of the other
  
        :return: subset value
        :rtype: int