Multi only: You can use the 
Plus and 
Minus options in the Input Options to specify whether the next polygon you draw is added to or subtracted from the area.With Multi only: You can use the Plus and Minus options in the Input Options to specify whether the next polygon you draw is added to or subtracted from the area.
Plus
The next polygon you draw is added to the area.
Minus
The next polygon you draw is subtracted from the area.
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