Suppose we form sketches using the four vectors from 3.7.2. ! (a) What are the constraints on a, b,.

Suppose we form sketches using the four vectors from  3.7.2. ! (a) What are the constraints on a, b, c, and d that will cause the sketch of the vector [a, b, c, d] to be [+1, +1, +1, +1]? !! (b) Consider two vectors [a, b, c, d] and [e, f, g, h]. What are the conditions on a, b, . . . , h that will make the sketches of these two vectors be the same?