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Switch to whiteboard mode
Undo the last annotation
Redo the last undo
Freeze/continue video action
Select a white or black background or one of 4 patterns
Zoom into and out of image
Repeat calibration
Change custom pen color and width
Write or draw free-form lines with custom pen
Change highlighter pen color
Write or draw free-form lines with transparent highlighter pen
Black pen (fine point on left, thick on right)
Red pen (fine point on left, thick on right)
Blue pen (fine point on left, thick on right)
Eraser (thin width on left, thick on right)
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