Marisa eats dinner at the restaurant fine dinerz a total of eight times. at each of her eight dinners she meets exactly one of five friends: caldwell, derek, emily, freddy, and guinevere. she meets each of the friends at least once. the order in which marisa’s friends meet her at fine dinerz is governed by the following constraints:
- she is never met by the same friend twice in a row.
- caldwell meets her at least twice.
-when she meets emily, she does not meet derek immediately afterward.
-freddy is neither the first nor the last person she meets.
-each time she meets derek, she meets either caldwell or freddy immediately afterward.

if marisa meets caldwell four times, then each of the following could be true except:
a. marisa meets emily fourth and guinevere fifth.
b. marisa meets freddy fourth and derek fifth.
c. marisa meets derek third and freddy fourth.
d. marisa meets emily sixth and freddy seventh.
e. marisa meets caldwell third and derek fourth.
.