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Lasso, polygon, and magnetic selection
tools.
The lasso tools
The lasso is used as a freeform selection tool.
Shift adds to the selection if another selection is active.
Option turns the lasso into a point-to-point polygon selector.
Option subtracts from the selection if another selection
is active.
Shift-option selects the intersect of two selections.
Hitting delete while drawing removes the last created
point if you're in polygon mode.
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