Question: 
Write a python function to print duplicants from a list of integers.


Model's Code:
def Repeat(nums):
    seen = set()
    duplicates = set()
    for num in nums:
        if num in seen:
            duplicates.add(num)
        else:
            seen.add(num)
    return list(duplicates)



Sample Correct Code:
def Repeat(x): 
    _size = len(x) 
    repeated = [] 
    for i in range(_size): 
        k = i + 1
        for j in range(k, _size): 
            if x[i] == x[j] and x[i] not in repeated: 
                repeated.append(x[i]) 
    return repeated 


Asserts:
assert Repeat([10, 20, 30, 20, 20, 30, 40, 50, -20, 60, 60, -20, -20]) == [20, 30, -20, 60]
assert Repeat([-1, 1, -1, 8]) == [-1]
assert Repeat([1, 2, 3, 1, 2,]) == [1, 2]


Tests:
Test 1 of 3: FAIL: AssertionError()

Test 659 of 974: 493/659 (74.81031866464339%): failed