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def matmul(a, b):
    rows = len(a)
    inner = len(b)
    cols = len(b[0])
    result = [[0] * cols for _ in range(rows)]
    for i in range(rows):
        for k in range(inner):
            for j in range(cols):
                result[i][j] += a[i][k] * b[k][j]
    return result


A = [[1, 2, 3], [4, 5, 6]]
B = [[7, 8], [9, 10], [11, 12]]
for row in matmul(A, B):
    print(row)

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