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@outsinre
Created February 26, 2016 15:23
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I want to merge lines that share common prefix. Example:
```
a 1
a 2
a-b 3
a-b 4
a-b 5
```
After merging:
```
a 1 2
a-b 3 4 5
```
The prefix is *a string with hypens*
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