126
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1 \begin{verbatim}
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2 | | | | ******* | |
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3 | | | |*#** **| telefax |
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4 | | | ***** email ***#** |
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5 | | | ** | | *****|
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6 | | |*#** | | |
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7 | | *** IM | | |
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8 | | ** | | | |
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9 | | *#* | | | |
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10 | | ** VoIP | | | |
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11 | | ** | | | |
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12 | voice * | | | |
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13 | video mail** | | | |
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14 | mess. #**| | | | |
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15 | #**** | | | | |
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16 |**** | | | | |
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17 ----------------------------------------------------------------
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18 | | | | | |
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19 | introduct. | growth | mature | saturation | decline |
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20 \end{verbatim}
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