Rmarkdown triple-back quote escape

escape_tripple_backquote.Rmd

You can insert a code chunk within a code chunk in Rmarkdown as shown here. This code chunk was used in my bookdown book "Package as Analysis" to show a SublimeText3 snippet that itself inserts a code chunk

````html
<snippet>
    <content><![CDATA[
`r ''````{r ${1:chunk_name}}
$0
```
]]></content>
    <!-- Optional: Set a tabTrigger to define how to trigger the snippet -->
    <tabTrigger>rchunk</tabTrigger>
    <!-- Optional: Set a scope to limit where the snippet will trigger -->
    <scope>text.html.markdown.multimarkdown, text.html.markdown</scope>
    <description>create a Rmd code chunk</description>
</snippet>
````

More simply:

````html
outside of in-chunk code chunk
`r ''````{r ${1:chunk_name}}
inside of in-chunk code chunk
```
back outside of in-chunk code chunk
````