A verbatim line.
Another verbatim line, with leading spaces.
A verbatim area delimitted by lines with marks.
Trailing spaces and TABs after the area marks are allowed, but not encouraged nor documented.
```Not a verbatim line, need one space after mark.
``` Not a verbatim area. The marks must be at the line beginning, no leading spaces. ```
The end of the file (EOF) closes the currently open verbatim area.