Questions 18-24

　　During a four-week period, cach of seven previously¹ 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 constraints² must be observed:

　　J is not advertised during a given week unless H is advertised during the immediately precceding 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 advertisernents?

　　(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

　　(A) G
　　(B) H
　　(C) J
　　(D) K
　　(E) M

23. Which one of the following is a product that could be advertised in any of the four weeks?

　　(A) H
　　(B) J
　　(C) K
　　(D) L
　　(E) O

24. Which one of the following is a pair of products that could be advertised during the same week as each other

　　(A) G and H
　　(B) H and J
　　(C) H and O
　　(D) K and O
　　(E) K and O
　　(F) M and O

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