Method add_free

ar.py:292–293

(self, v: str)

    self.do_why = True

  def add_free(self, v: str) -> None:
    self.v2e[v] = {v: frac(1)}

  def replace(self, v0: str, e0: dict[str, float]) -> None:
    for v, e in list(self.v2e.items()):