ACAD4

LINE Specify first point: 1,1
Specify next point or [Undo]: 7.1
Specify next point or [Undo]: undo
Specify next point or [Undo]: undo
All segments already undone.
Specify first point: 1,1
Specify next point or [Undo]: @3.5,0
Specify next point or [Undo]: @0,3.5
Specify next point or [Close/Undo]: @-3.5.0
Point or option keyword required.
Specify next point or [Close/Undo]: @-3.5,0
Specify next point or [Close/Undo]: close