Markdown link references

Today I learned that we can use link references in markdown like this:

# Link by Reference with `alt` option
[Link by reference][my-link]

[my-link]: https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet#links "My Link"

# Regular link
[Regular link](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet#links)

In this case the first link will be displayed as: Link by reference

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