/-MSpaaaaa
                  /MSpaaaa
                 |       \-MSpaaaap
            /MSxaaa
           |     |       /-MSpaaapa
           |      \MSpaaap
       /MSxaa            \-MSpaaapp
      |    |
      |    |             /MSxaapap-MSaaapapp
      |    |      /MSxaapa
      |     \MSxaap      \-MSpaapaa
      |          |
      |           \MSaaapp-MSaaappp
   /MSxa
  |   |                  /-MSxapaaa
  |   |           /MSxapaa
  |   |          |       \MSxapaap-MSxapaapa
  |   |     /MSxapa
  |   |    |     |       /MSxapapa-MSxapapaa
  |   |    |      \MSxapap
  |    \MSxap            \-MSxapapp
  |        |
  |        |      /-MSaappa
  |         \MSxapp
-MSx             |       /MSxapppa-MSxapppax
  |               \MSxappp
  |                      \MSxapppp-MSxappppx
  |
  |               /MSxpaaa-MSxpaaaa
  |         /MSxpaa
  |        |      \MSxpaap-MSxpaapp
  |    /MSxpa
  |   |    |      /MSxpapa-MSxpapaa
  |   |     \MSxpap
  |   |           \MSxpapp-MSxpappp
  |   |
   \MSxp                 /-MSxppaaa
      |           /MSxppaa
      |     /MSxppa      \-MSxppaap
      |    |     |
      |    |      \-MSxppap
       \MSxpp
           |             /-MSxpppaa
           |      /MSxpppa
            \MSxppp      \-MSxpppap
                 |
                  \MSxpppp-MSxppppx