python 实现两个多维数组去重处理

a = [[1,2,3,4],[5,6,7,8],[11,12,13,14],[23,24,12,11]]

b = [[5,6,7,8],[23,24,12,11]]

c = []

for i in a:

　　if i not in b:

　　　　c.append(i)

print(c)