\begin{verbatim}
|            |             |          |    *******  |          |
|            |             |          |*#**       **|  telefax |
|            |             |      ***** email       ***#**     |
|            |             |    **    |             |     *****|
|            |             |*#**      |             |          |
|            |           *** IM       |             |          |
|            |         **  |          |             |          |
|            |      *#*    |          |             |          |
|            |    ** VoIP  |          |             |          |
|            |  **         |          |             |          |
|        voice *           |          |             |          |
| video  mail**            |          |             |          |
| mess.   #**|             |          |             |          |
|    #****   |             |          |             |          |
|****        |             |          |             |          |
----------------------------------------------------------------
|            |             |          |             |          |
| introduct. | growth      | mature   | saturation  | decline  |
\end{verbatim}
