+---+
  |   |
  |
  |
  |
__+__

-------------------

  +---+
  |   |
  |
  |
  |
__+__
a
--------------a----

  +---+
  |   |
  |
  |
  |
__+__
a, i
----i-i----i--a-i--

  +---+
  |   |
  |
  |
  |
__+__
a, i, s
----i-i---si--a-i--

  +---+
  |   |
  |
  |
  |
__+__
a, i, s, t
---ti-i---si--a-it-

  +---+
  |   |
  |
  |
  |
__+__
a, e, i, s, t
---ti-i-e-si--a-it-

  +---+
  |   |
  |
  |
  |
__+__
a, e, i, l, s, t
--lti-i-e-si--alit-

  +---+
  |   |
  |
  |
  |
__+__

---------

  +---+
  |   |
  |
  |
  |
__+__
a
------a--

  +---+
  |   |
  |
  |
  |
__+__
a, t
----t-at-

  +---+
  |   |
  |
  |
  |
__+__
a, e, t
---et-ate

  +---+
  |   |
  |
  |
  |
__+__
a, e, i, t
i--et-ate

  +---+
  |   |
  |
  |
  |
__+__
a, e, i, r, t
i--etrate

  +---+
  |   |
  |   O
  |
  |
__+__
a, e, i, n, r, t
i--etrate

  +---+
  |   |
  |   O
  |   |
  |
__+__
a, e, h, i, n, r, t
i--etrate

  +---+
  |   |
  |   O/
  |   |
  |
__+__
a, e, h, i, n, r, s, t
i--etrate

  +---+
  |   |
  |  \O/
  |   |
  |
__+__
a, d, e, h, i, n, r, s, t
i--etrate

  +---+
  |   |
  |  \O/
  |   |
  |  /
__+__
a, c, d, e, h, i, n, r, s, t
i--etrate