--- /dev/null
+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/