6.22 Use the Gram-Schmidt process to find an orthogonal basis for the subspaces of R" spanned by the following ordered sets of vectors for the appropriate n: (a) / {[0, 1, 1], [1, 1, 1]' } (b) { [-2, 1, 3], [2, 1, 2]'} (c) VV {[1, 2, 1, 1], [-2, 1, 1, -1], [1, 2, 1,3]}