Common elements between two lists with no duplicates

Question

Problem is this, 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]
         


        

Answer 1

c = []
for items in a:
    for numbers in b:
        if items == numbers:
            if items in c:
                None
            else:
                c.append(items)
print(c)