def grouping(group):
    # if len(group) < 2 - then it is either empty, or has one element and there is nothing to group
    if len(group)<2:
        return False, group, []
    trigger = False
    group_list = []
    no_pair = []
    for i in range(len(group)):
        has_no_pair = True
        for k in range(len(group)):
            if i != k:
                test = set(group[i]).isdisjoint(group[k])
                if not test:
                    trigger = True
                    has_no_pair = False
                    new_group = set(group[i]|group[k])
                    if not new_group in group_list:
                        group_list.append(new_group)
        if has_no_pair:
            no_pair.append(group[i])
    return trigger, no_pair, group_list

loner_list = []
trigger = True
while trigger:
    trigger, no_pair, new_group = grouping(new_group)
    loner_list = loner_list + no_pair