def _edits1(word: str) -> Set[str]:
    """
    Return a set of words with edit distance of 1 from the input word
    """
    splits = [(word[:i], word[i:]) for i in range(len(word) + 1)]
    deletes = [L + R[1:] for L, R in splits if R]
    transposes = [L + R[1] + R[0] + R[2:] for L, R in splits if len(R) > 1]
    replaces = [L + c + R[1:] for L, R in splits if R for c in thai_letters]
    inserts = [L + c + R for L, R in splits for c in thai_letters]

    return set(deletes + transposes + replaces + inserts)
Return a set of words with edit distance of 1 from the input word