Foo [bar] [1].

Foo [bar][1].

Foo [bar]
[1].

[1]: /url/  "Title"


With [embedded [brackets]] [b].


Indented [once][].

Indented [twice][].

Indented [thrice][].

Indented [four][] times.

 [once]: /url

  [twice]: /url

   [thrice]: /url

    [four]: /url


[b]: /url/

With [angle brackets][].

And [without][].

[angle brackets]: <http://example.com/> "Angle Brackets"
[without]: http://example.com/ "Without angle brackets."

With [line
breaks][]

and [line 
breaks][] with one space.

and [line  
breaks[] with two spaces.

[line breaks]: http://example.com "Yes this works"

[short ref]

[short 
ref]

[short ref]: http://example.com "No more hanging empty bracket!"

[a ref]

[a ref]: http://example.com
    "Title on next line."