Exercise 1.14.  Draw the tree illustrating the process generated by the 
count-change procedure of section 1.2.2 in making change for 11 cents.

(count-change 11)
      |
      |
      (cc 11 5)
     /         \
    (cc 11 4)  (cc (- 11 50) 5)
    |          |
    |          0
  __|_______
 /          \
(cc 11 3)   (cc (- 11 25) 4)
  |         |
  |         0
  |____________
 /             \
(cc 11 2)      (cc 1 3)
  |           /        \
  |          (cc 1 2)  (cc (- 1 10) 3)
  |          |         |
  |          |         0
  |          |_______
  |         /        \
  |        (cc 1 1)  (cc (- 1 5) 2)
  |        |         |
  |        |         0
  |        |________
  |       /         \
  |      (cc 1 0)   (cc 0 1)
  |      |          |
  |      0          1
  |___________
 /            \
(cc 11 1)     (cc 6 2)
  |          /        \
  |         (cc 6 1)  (cc 1 2)
  |         |        /        \
  |         |       (cc 1 1)  (cc -4 2)
  |         |       |         |
  |         |       |______   0
  |         |      /       \
  |         |     (cc 1 0) (c 0 1)
  |         |     |        |
  |         |     0        1
  |         |________
  |        /         \
  |       (cc 6 0)   (cc 5 1)
  |       |         /        \
  |       0        (cc 5 0)  (cc 4 1)
  |                |        /        \
  |                0       (cc 4 0)  (cc 3 1)
  |                        |        /        \
  |_________               0       (cc 3 0)  (cc 2 1)
 /          \                      |        /        \
(cc 11 0)   (cc 10 1)              0       (cc 2 0)  (cc 1 1)
|          /         \                     |        /        \
0         (cc 10 0)  (cc 9 1)              0       (cc 1 0)  (cc 0 1)
          |         /        \                     |         |
          0        (cc 9 0)  (cc 8 1)              0         1
                   |        /        \
                   0       (cc 8 0)  (cc 7 1)
                           |        /        \
                           0       (cc 7 0)  (cc 6 1)
                                   |        /        \
                                   0       (cc 6 0)  (cc 5 1)
                                           |        /        \
                                           0       (cc 5 0)  (cc 4 1)
                                                   |        /        \
                                                   0       (cc 4 0)  (cc 3 1)
                                                           |        /        \
                                                           0       (cc 3 0)  (cc 2 1)
                                                                   |        /        \
                                                                   0       (cc 2 0)  (cc 1 1)
                                                                           |        /        \
                                                                           0       (cc 1 0)  (cc 0 1)
                                                                                   |         |
                                                                                   0         1