Okay, I'm just confused since we use commas all the time in the `Output` column without quotes and swirl seems to handle them just fine. Example from line 30 of Intro to R, module1:

```
When we did `z * 2 + 100` in our earlier example, `z` was a vector of length 3, but technically `2` and `100` are each vectors of length 1.
```