if isinstance(score[item], tree.Tree):  # Also, make this use the find_next_node() function (or whatever I called it)
                    score_index_to_replace = item
            if score_index_to_replace is None:
                raise ValueError("No more nodes to fill in")

            time_remaining = max_time - score_len(score)
            new_phrase, syncs = choose_phrase(instr, syncs, score_len(score), time_remaining, score)
            score = score[:score_index_to_replace-1] + new_phrase + score[score_index_to_replace+1:]
            score = score[:score_index_to_replace] + new_phrase + score[score_index_to_replace+1:]

    except ValueError:
        return (score, syncs)


def choose_phrase(instr, syncs, current_time, time_remaining, score):
    '''Filters grammars for ones that match the sync option, and phrases that fit the time remaining in the score'''