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create code fences with backticks ` or tildes ~
```
like so
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(echo ab; echo cd) | /usr/bin/egrep -o '^.'on OpenBSD 6.2 givesaand thencso it's probably at least a macOS buga\nb\nc\nd\n. In that thegrepversion is2.5.1-FreeBSD. What version does OpenBSD have?a\nb\nc\nd\n(as another data point).