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# Take two lists, say for example these two:

#   a = [1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89]
#   b = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13]
# and write a program that returns a list that contains only the elements that are common between the
#  lists (without duplicates). Make sure your program works on two lists of different sizes.

a = [1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 13, 13, 13, 13, 12]
b = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 13, 13, 13]
c = []
for n in b:
    if n in b:
        if n not in c:
            c.append(n)
print(c)