import re


def get_merge_suggestions(bilou_tag_data):
    """Return all the tokens which are meant to be merge

    Args:
        bilou_tag_data (str): Botok segmented data with bilou tag

    Returns:
        list: list of tokens that are meant to be merge
    """
    merge_suggestions = [merge_suggestion for merge_suggestion,_ in re.findall(r'(\S+/B (\S+/I )+)', bilou_tag_data)]
    return list(set(merge_suggestions))