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$a: 1='a1', 2='a2', 3='a3'<br />
$b: 2='b2', 3='b3', 4='b4'<br />
<br />
^a.add[$b]: 1='a1', 2='b2', 3='b3', 4='b4'<br />
^a.sub[$b]: 1='a1'<br />
$c[^a.intersection[$b]]: 2='a2', 3='a3'<br />
$c[^a.union[$b]]: 1='a1', 2='a2', 3='a3', 4='b4'<br />
^a.intersects[$b]? y<br />
^a.intersects[ ]? n<br />
^a.intersects[$.5[x5]]? n<br />
^c.contains[1] ? y<br />
^c.delete[2], ^c.contains[2] ? n<br />
^c.delete[$empty]<br />
^c.delete[]: error<br />
1='a1', 3='a3', 4='b4'<br />
<hr />