code: def all_state_variables_read(self):
          '''
              list(StateVariable): List all of the state variables read
          '''
          all_state_variables_read = [f.all_state_variables_read() for f in self.functions + self.modifiers]
          all_state_variables_read = [item for sublist in all_state_variables_read for item in sublist]
          return list(set(all_state_variables_read)f all_state_variables_read(self):
          '''
              list(StateVariable): List all of the state variables read
          '''
          all_state_variables_read = [f.all_state_variables_read() for f in self.functions + self.modifiers]
          all_state_variables_read = [item for sublist in all_state_variables_read for item in sublist]
          return list(set(all_state_variables_read))
docs: list(StateVariable): List all of the state variables read