[F&O] Examples 15.2.2, 15.2.3, 15.2.4 (op:union, op:intersect, op:except)

The example given will not produce the stated results if $item1, $item2
and $item3 are not three unique nodes.

$item1, $item2 and $item3 must be defined or at least it must be said that
they are three unique nodes.


Dimitre Novatchev.

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