A song, poem, or verse
(label?, title?, subtitle?, (verse-line | verse-group)+, (attrib)*)
The following, in order:
...
<body>
<verse-group>
<verse-group>
<verse-line>hail ye oh wise one</verse-line>
<verse-line>master of the medical universe</verse-line>
<verse-line>jack of all trades</verse-line>
<verse-line>family doc</verse-line>
</verse-group>
<verse-group>
<verse-line>medicine man</verse-line>
<verse-line>allay my fears, crank the gears</verse-line>
<verse-line>fix me up, tune it up</verse-line>
<verse-line>the go to man, handyman</verse-line>
</verse-group>
...
</verse-group>
</body>
...
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