(TypeError): unhashable type: 'list'

I'm new to code So this is the code i'm trying to work on:

a = [1, 2, 3, 4]
b = [2, 3, 4, 6, 8]
c = [3, 4, 5]
l = [a, b, c]
l

d = [1,4,2]

def f(l,d):
    l = set(l)
    d = set(d)
    return l.Intersect(d).count()

f(l,d)

gives me TypeError: unhashable type: 'list'