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create code fences with backticks ` or tildes ~
```
like so
``` -
add language identifier to highlight code
```python
def function(foo):
print(foo)
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lang-tex
\letis generally not usable on latex-defined commands, hence\NewCommandCopy\NewCommandCopyin place of\letand the behavior is the same (that is, has the same seemingly incorrect behavior) :/\letdoesn't save the original definition so isn't usable for therenewcommandkinds of use that you indicate are the end use case.