```

% pandoc --reference-location=block -t markdown --reference-links --wrap=preserve

[a](u)

[a](u)

[a](u2)

[A](u)

[a](u){.foo}

[a](u3)

^D

[a]

  [a]: u

[a]

  [a]: u

[a][1]

[A][]

[a][2]

  [1]: u2

  [A]: u

  [2]: u {.foo}

[a][3]

  [3]: u3

```

```

% pandoc

[a]

  [a]: u

[a]

  [a]: u

[a][1]

[A][]

[a][2]

  [1]: u2

  [A]: u

  [2]: u {.foo}

[a][3]

  [3]: u3

^D

a

a

a A a

a

```