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== How can they be useful? ==
On the mailing list, Hans sometimes points one to minimal examples of a feature being asked about. You can recursively grep through the (uncompressed) archive to find the example. For example, I had asked about coupled problems and solutions, for which the relevant mechanism is blocks . To quote Hans: "(there are some examples in the test suite under blocks)." After unpacking I unpacked the archive (into <code>/tmp/doc/</code>), the following command located the examples:
<pre>
