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create code fences with backticks ` or tildes ~
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like so
``` -
add language identifier to highlight code
```python
def function(foo):
print(foo)
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dm-crypt, you can set up an encrypted partition to use, say/dev/urandomas a keyfile (Causing the partition to effectively be useless on reboot). However no matter what, you will need to format the partition during boot.