(venv) erik@Eriks-MacBook-Pro py % python3 ./lark_test.py
a_atom
  a_clause
    clause
      a_term
        None
        foo
       in 
      a_clause
        clause
          a_field	FIELD
           or 
          a_clause
            clause
              a_term
                None
                bar
               in 
              a_field	FIELD

(venv) erik@Eriks-MacBook-Pro py % python3 ./lark_test.py
a_atom
  a_clause
    clause
      a_clause
        clause
          a_term
            None
            foo
           in 
          a_clause
            clause
              a_field	FIELD
               or 
              a_term
                None
                bar
       in 
      a_field	FIELD

(venv) erik@Eriks-MacBook-Pro py % python3 ./lark_test.py
a_atom
  a_clause
    clause
      a_clause
        clause
          a_term
            None
            foo
           in 
          a_field	FIELD
       or 
      a_clause
        clause
          a_term
            None
            bar
           in 
          a_field	FIELD