import copy

def func(value):
    '''
    所有的元素不同
    :return:
    '''

    num = []
    list1 = []
    list2 = []
    list3 = []
    i = -1
    for j in value:
        i += 1
        num.clear()
        for k in value[i:]:
            num.append(k)
            a = copy.deepcopy(num)
            list1.append(a)
    for n in list1:
        set1 = set(n)
        list4 = list(set1)
        list2.append(list4)
    for m in list2:
        if m not in list3:
            list3.append(m)
    print(list3)

aar =  [1,3,5,5,7,9]
func(aar)