Foo bar.

Foo bar.

Foo bar.

With embedded [brackets].

Indented once.

Indented twice.

Indented thrice.

Indented [four][] times.

    [four]: /url

this should work

So should this.

And this.

And this.

And this.

But not [that] [].

Nor [that][].

Nor [that].

[Something in brackets like this should work]

[Same with this.]

In this case, this points to something else.

Backslashing should suppress [this] and [this].

Here's one where the link breaks across lines.

Here's another where the link breaks across lines, but with a line-ending space.