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tl;dr
Too Long; Didn't Read.
tl;dr is a short summary of a long text. As it's done here, tl;dr is used
to quickly describe what is going to be said. It is intended for people
who don't have time or are lazy to read the whole text.
tl;dr can be placed at the beginning or end. Here's a recommendation on
where to put the tl;dr section:
If the tl;dr is important information, put it at the top.
If it's for convenience, put it at the bottom.