You also redrafted the second paragraph in the following way: “You may attend any one of five workshops (M, 8 a. m to 10 a. m.; T, 11 a. m. to 1 p. m.; W, 8 a. m to 10 a. m., W, 11 a. m. to 1 p. m.; Th, 1 p. m. to 3 p. m.). Please come with an empty stomach—a breakfast buffet or a lunch box will be provided. The company will donate $100 to Red Cross for your attendance at any one of the workshops. You will receive a disaster training certificate for your participation in the workshop, which allows you to step forward and volunteer at a local community center in the event of an emergency.” In this re-drafted passage, you have applied all of the following principles except what?