README.md in trackler-2.2.1.86

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 ```
 
 ```text
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    +--+
 ```
 
 ```text
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 +--+
 |  |
 +--+
 ```
 
 ```text
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 ```
 
 You may assume that the input is always a proper rectangle (i.e. the length of
 every line equals the length of the first line).
 