Both lines from 0,10 > 0,0 > 10,0, the second with a 5.0 fillet - note the "bulge" on the second vertex (for some reason it's displayed here as a phone number - dunno how to stop it!).
(entmake '((0 . "LWPOLYLINE") (100 . "AcDbEntity") (67 . 0) (410 . "Model") (8 . "0") (100 . "AcDbPolyline")
(90 . 3) (70 . 0) (43 . 0.0) (38 . 0.0) (39 . 0.0)
(10 0.0 10.0) (40 . 0.0) (41 . 0.0) (42 . 0.0)
(10 0.0 0.0) (40 . 0.0) (41 . 0.0) (42 . 0.0)
(10 10.0 0.0) (40 . 0.0) (41 . 0.0) (42 . 0.0)
(210 0.0 0.0 1.0)
)
)
(entmake '((0 . "LWPOLYLINE") (100 . "AcDbEntity") (67 . 0) (410 . "Model") (8 . "0") (100 . "AcDbPolyline")
(90 . 4) (70 . 0) (43 . 0.0) (38 . 0.0) (39 . 0.0)
(10 0.0 10.0) (40 . 0.0) (41 . 0.0) (42 . 0.0)
(10 0.0 5.0) (40 . 0.0) (41 . 0.0) (42 . 0.414214); < this isn't a Skype number! ;
(10 5.0 0.0) (40 . 0.0) (41 . 0.0) (42 . 0.0)
(10 10.0 0.0) (40 . 0.0) (41 . 0.0) (42 . 0.0)
(210 0.0 0.0 1.0)
)
)
If you are unsure how the (entmake should be made up, first create the element then issue (entget (car (entsel))) on it and look at the structure. (Similar for STYLES, etc.)
S