Please help me with this problem involving the Gram-Schmidt process.

6. (12 points) Let W be the subspace of R spanned by the vectors u1 = (1, 0, 1, 0), u2 = (0, 1, 1, 0), u3 = (0, 0, 1, -1). Use the Gram-Schmidt process to transform the basis {ul, u2, us} into an orthonormal basis