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create code fences with backticks ` or tildes ~
```
like so
``` -
add language identifier to highlight code
```python
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``` - put returns between paragraphs
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lang-tex
x\in \{y\in Y\mid \exists z\in Z . (y,z)\in W\}in the subscripts, to choose a not particularly meaningful example. egreg's solution did have a bit too much space for my taste, so this is perfect.