def _intersection(A,B):
    """
    A simple function to find an intersection between two arrays. 
    
    @type A: List 
    @param A: First List
    
    @type B: List
    @param B: Second List
    
    @rtype: List
    @return: List of Intersections
    """
    intersection = []
    for i in A:
        if i in B:
            intersection.append(i)
    return intersection