5566.md

```
% pandoc -t asciidoc -f html
fo<span class="c">o</span> f<span class="c">o</span>o <span class="c">f</span>oo <span class="c">foo</span>
^D
fo[.c]##o## f[.c]##o##o [.c]##f##oo [.c]#foo#
```