Process a list of reference answers.
    If equal or more than half of the reference answers are "CANNOTANSWER", take it as gold.
    Otherwise, return answers that are not "CANNOTANSWER".

def handle_cannot(reference_answers: List[str]):
    """
    Process a list of reference answers.
    If equal or more than half of the reference answers are "CANNOTANSWER", take it as gold.
    Otherwise, return answers that are not "CANNOTANSWER".
    """
    num_cannot = 0
    num_spans = 0
    for ref in reference_answers:
        if ref == 'CANNOTANSWER':
            num_cannot += 1
        else:
            num_spans += 1
    if num_cannot >= num_spans:
        reference_answers = ['CANNOTANSWER']
    else:
        reference_answers = [x for x in reference_answers if x != 'CANNOTANSWER']
    return reference_answers