A (auto complete)

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If 2 or more lines have been draw and the area is not closed, A will draw a line from the current point back to the starting point, completing the area.

 

Example:

 

Type 20.
Press 'Right'.
Press 'Enter'.
Type 20.
Press 'Down'.
Press 'Enter'.
Press 'A'.
Notice the cursor went from the current location back to the beginning.
Press 'Enter'.

20FootLineNoEnter

 

20DownNoEnter

 

AutoComplete