Two Substring matched element position in a list

[AnushaC]

Hi,


>>> l1
['Anushaabcdis', 'bcdef', 'ushaabcdisAn']
>>> l2
['An', 'test']
>>> l3
['ab', 'is']

for ele in l1:
for ele1 in l2:
for ele2 in l3:
f3 = l1.find(ele1)
f4 = l1.find(ele2)
if (f3 < f4):
tl.append(ele)

Is there a better way of checking two substring matching position in a list. Because in my real example l1,l2,l3 are huge and it is taking me computationally exhaustive search not able to handle huge string. can I directly find the matching string position in a list in python??

Thanks,
Anusha