getchildnode
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This is nondterministic. Backtrack track into it to get all child nodes.


Example:


       form(This, "AddressTree", getchildnode(Parent, ChildNode, ChildText, TickState)),

       % flow = (i,o,o,o)

/*

       Parent can be: root.


       TickState can be: 1, 2, or 3 where:

               1 = all ticked

               2 = all unticked

               3 = some children ticked

*/