问从另外两个列表派生一个新的列表列表，其中如果L1中的元素不在L2中，则附加这些元素

EN

from typing import List
def non_intersecting(L1: List[List[str]], L2: List[str]) -> List[List[str]]:    
"""Return a new list that contains the original lists inside L1 that do not
contain any of the string in L2

>>> non_intersecting([['e', 'h', 'c', 'w'], ['p', 'j'], ['w', 's', 'u']], ['k', 'w'])
[['p', 'j']]
"""

listas = []

if len(L2) == 0:
    return L1
elif len(L2) > 0:
    for index in range(len(L2)):
        for lists in L1:
            if lists not in listas:
                if L2[index] not in lists:
                    listas.append(lists)

return listas