PYTHON

# find the common elements in the list.

# find the common elements in the list.
l1 = ['a','b','c','d','e','f','g','h','a','b']
l2 = ['e','f','g','h','i','j']
s1=set(l1).intersection(l2)
print(list(s1))

#['g', 'f', 'e', 'h']

find common in lists

>>> a = [1, 2, 3, 4]
>>> b = [2, 3, 4, 5]
>>> c = [3, 4, 5, 6]
>>> set(a) & set(b) & set(c)
{3, 4}