class_docstr: This class is inherited by classes which deal with state names of variables.
  The state names are stored in instances of `StateNameMixin`. The conversion between
  state number and names are also handled by methods in this class.
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docstr: Updates the attributes of this class with another factor `phi1`.
  
  Parameters
  ----------
  phi1: Instance of pgmpy.factors.DiscreteFactor
      The factor whose states and variables need to be added.
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code: def add_state_names(self, phi1):
      """
      Updates the attributes of this class with another factor `phi1`.
  
      Parameters
      ----------
      phi1: Instance of pgmpy.factors.DiscreteFactor
          The factor whose states and variables need to be added.
      """
      self.state_names.update(phi1.state_names)
      self.name_to_no.update(phi1.name_to_no)
      self.no_to_name.update(phi1.no_to_name)
  
label_desc: Use image node_id 4 for calling the StateNameMixin obj's underlying member method code with example usage: obj.add_state_names(phi1) without return types