import numpy as np

def for_loop_matrix_multiplication(A, B):
    """Fifth and final version of a for loop matrix multiplication."""
    new_matrix = []

    for row in A:
        new_row = []
        for col in zip(*B):
            new_row.append(sum([x*y for (x, y) in zip(row, col)]))

        new_matrix.append(new_row)
    
    return new_matrix

if __name__ == '__main__':
    A = [[1, 2, 3], [4, 5, 6]]
    B = [[7, 8], [9, 10], [11, 12]]
    
    print(for_loop_matrix_multiplication(A, B))
    # The result should be: [[58, 64], [139, 154]]
    # You can check this by doing: np.matmul(A, B)