Exercise 11.1.2: find the next permutation in lexicographic order. about for each permutation of {1, 2, 3, 4, 5, 6, 7}, give the next largest permutation or indicate that the permutation is the last one in lexicographic order.

(a) (1, 2, 3, 4, 5, 6, 7)
(b) (7, 6, 5, 4, 3, 2, 1)
(c) (1, 7, 6, 4, 2, 3, 5)
(d) (3, 7, 6, 5, 4, 2, 1)
(e) (5, 4, 7, 6, 3, 2, 1)