CFL: Fix printing of CFGs

    def __hash__(self):

        return hash(self.name)

    def __lt__(self, other) -> bool:

        return self.name < other.name

class Character:

    def __init__(self, name: str):

        return GeneratesResult(cnf.init in table[n - 1][0], cnf, table)

    def to_string(self) -> str:

        nonterms = sorted(self.nonterminals)

        nonterms.remove(self.init)

        nonterms.insert(0, self.init)

        # put initial state first

        nonterms = sorted(self.nonterminals, key=lambda x: (x != self.init, x))

        out = []

        for r in self.rules.keys():

        for r in nonterms:

            if r not in self.rules:

                continue

            to = sorted(map(lambda prds: "".join(map(lambda x: x.name, prds))

                                         if prds else "ε", self.rules[r]))

            out.append(f"{r.name} -> {' | '.join(to)}")