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(8) Note: Open the note window, write the content and click "OK" to generate a
note.
(9) Roaming: If roaming is selected, multi-finger writing, single-finger dragging
and multi-finger scaling cannot be carried out.
(10) Four-line grid: Open the four-line grid window to automatically identify
writing.
(11) Undo: Undo the last operation. A maximum of 10 steps can be undone.