def _merge_deprel(deprel):
    """
    Provide a merging of the closely related bags.
    In fact, simply modify deprel name according to (Vulic et al., 2016).

    :param deprel: An original deprel.
    :return: A modified deprel.
    :rtype: str

    """
    if deprel in ['dobj', 'iobj']:
        return 'obj'
    if deprel in ['nsubj', 'nsubjpass']:
        return 'subj'
    if deprel in ['xcomp', 'ccomp']:
        return 'comp'
    if deprel in ['advcl', 'advmod']:
        return 'adv'
    return deprel
