"Proper nesting works wonders" (Copyright, 2006)
and PNWW (TM, 2006) are registered by ww. Infringement will result in litigation or maybe just boredom.

Try this sequence:

narrative exposition...
blah, blah, blah....

<c>
code starts here...
002: ...
003: ...
</c>
code tag has been closed
<readmore>
<c>
code tag reopened
more code... hidden inside the readmore...
</c>
</readmore>

code and readmore closed; blah, blah, blah is again visible