@staticmethod
def combine_kw_list(lst, n=100):
    """Combine long kw_list into "+" separated chunks"""
    for ii, jj in enumerate(lst):
        if ii == 0:
            temp = jj
            master = []
        elif len(temp + ' + ' + jj) < n:
            temp += ' + ' + jj
        else:
            master.append(temp)
            temp = jj
    return master
