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Thank you! Unfortunately the two lines you are suggesting still result in 'Hello Hello' on my machine. (I have copied and pasted so I cannot have made a typo.) It seems my commands are alright but my machine behaves differently for some reason or other...

Triplesmeg
– Triplesmeg

2017-11-20 20:45:08 +00:00
Commented Nov 20, 2017 at 20:45
You may need to use [[:>:]] in place of \> or \b for the word boundary in OSX sed - see for example sed whole word search and replace

steeldriver
– steeldriver

2017-11-20 22:30:57 +00:00
Commented Nov 20, 2017 at 22:30

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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)
```
put returns between paragraphs
for linebreak add 2 spaces at end
_italic_ or **bold**
indent code by 4 spaces
backtick escapes `like _so_`
quote by placing > at start of line
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