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First, you use drag-select to select a group of nodes.
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Then, you use
CtrlClick to
unselect individual nodes.
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Finally, you use
ShiftClick to
add nodes to your set and then click mouse button 2 to indicate you have
finished selecting.
You may find it useful to adjust the view orientation to make particular
items in the viewport more accessible. You can adjust the view orientation at
any point during the selection process. For information on the view
manipulation tools, see
Manipulating the view and controlling perspective.