The elements in the first row of the 3 by 3 transformation matrix T are sgn(a) del(a-1), sgn(b) del(b-1), and sgn(c) del(c-1). The elements in the second row are sgn(a) del(a-2), sgn(b) del(b-2), and sgn(c) del(c-2). And the elements in the third row are sgn(a) del(a-3), sgn(b) del(b-3), and sgn(c) del(c-3).