U must be interviewed at some time before R　　
Z must be interviewed at some time after X and at some time after Y.

12. Which one of the following is a sequence, from first to last, in which the no hostile witnesses could be interviewed?　　
(A) Q with R, U, X, Y, Z　　
(B) Q, U, R, X, with Y, Z　　
(C) U, X, Q, with R, Y, Z　　
(D) U, Y, Q, with R, X, Z　　
(E) X, Q, with U, Z, R, Y

 
13, Which one of the following is acceptable as a complete schedule of witnesses for Tuesday morning. Tuesday afternoon, and Wednesday morning, respectively?　　
(A) Q, R, none　　(B) R, none, Y　　(C) U, Y, none　　(D) U, Y, none　　
(F) Y, Z, none

14.If Y is interviewed at some time after X, which one of the following must be a day reserved for interviewing hostile witnesses?　　
(A) Monday　　(B) Tuesday　　　(C) Wednesday　　(D) Friday　　(E) Saturday

15. If R is interviewed at some time after Y which one of the following must be a day reserved for interviewing hostile witnesses?　　
(A) Monday　　(B) Tuesday　　(C) Wednesday　(D) Thursday　　(E) Friday

16. If on Wednesday afternoon and on Monday the attomey conducts no interviews, which one of the following be true?　　
(A) Q is interviewed on the same day as U　　
(B) R is interviewed on the same day as Y　　
(C) Y is interviewed on the same day as U　　
(D) Y is interviewed on the same day as Wednesday　　
(E) Z is interviewed on the same day as Friday

17. If Z is interviewed on Saturday morning which one of the following can be true?　　(A) Wednesday is a day reserved for interviewing hostile witnesses.　　
(C) Friday is a day reserved for interviewing hostile witnesses.　　
(D) R is interviewed on Thursday　　
(E) U is interviewed on Tuesday　　
(F) Y is interviewed at some time before Thursday

Questions 18-24　　
During a four-week period, each of seven previously unadvertised products-G, H, J, K, L, M, and O-will be advertised. A different pair of these products will be advertised each week. Exactly one of the products will be a member of two of these four pairs. The following constraints must be observed:　　
J is not advertised during a given week unless
H is advertised during the immediately preceding week. 　　
The product that is advertised during two of the weeks is advertised during week 4 but is not advertised during week 3　　
G is not advertised during a given week unless either J or else O is also advertised that week.
K is advertised during one of the first two weeks　　
O is one of the products advertised during week 3

18. Which one of the following could be the schedule of advertisements?　　
(A) week 1: G, J; week 2: K, L; week 3: O, M; week 4: H, L　　
(B) week 1: H, K; week 2: J, G; week 3: O, L; week 4: M, K　　
(C) week 1: H, K; week 2: J, M; week 3: O, L; week 4: G, M　　
(D) week 1: H, L; week 2: J, M; week 3: O, G; week 4: K, L　　
(E) week 1: K, M; week 2: H, J; week 3: O, G; week 4: L, M

 
19. Which one of the following is a pair of products that CANNOT be advertised during the same week as each other?　　
(A) H and k 　　(B) H and M　　(C) J and O　　
(D) K and L　　(E) L and M

20. Which one of the following must be advertised during week 2?　　
(A) G　　(B) J　　(C) K　　(D) L　　(E) M

21. Which one of the following CANNOT be the product that is advertised during two of the weeks?　　
(A) G　　(B) H　　(C) K　　(D) L　　(E) M

22. If L is the product that is advertised during two of the weeks, which one of the following is a product that must be advertised during one of the weeks in which L is advertised?