Consider an experiment to compare the effectiveness of two different pesti- cides, A and B, both applied in two different forms: spray (A and B) and powder (A2 and B). A control treatment (i.e., no pesticide), C, is also included in the experi- ment for comparison purposes. Thus, altogether there are 5 treatments (A, A2, B, B2 and C) and each treatment is randomly applied to n uniformly infested plots of land. Obtain a complete set of meaningful orthogonal contrasts and describe what each contrast is testing.