Syntax: A single line

  A verbatim line.

Syntax: A single line with leading spaces

    Another verbatim line, with leading spaces.

Syntax: Area (block)

  A verbatim area delimited
         by lines with marks.

Syntax: Area (block) with trailing spaces

  Trailing spaces and TABs after the area marks
  are allowed, but not encouraged nor documented.

Invalid: No space between mark and contents

```Not a verbatim line, need one space after mark.

Invalid: Leading spaces on block marks

``` Not a verbatim area. The marks must be at the line beginning, no leading spaces. ```

Closing: EOF closes the open block

  The end of the file (EOF) closes
  the currently open verbatim area.