open
arclength
Begin section !1
Begin curve !1
0.0	20.0	0.0
0.0	0.0	20.0
0.0	-20.0	0.0

Begin Section!2
Begin curve !1
30.0	18.0	0.0
30.0	0.0	18.0
30.0	-18.0	0.0
30.0	18.0	0.0

Begin Section!3
Begin curve !1
60.0	10.0	0.0
60.0	0.0	10.0
60.0	-10.0	0.0
60.0	10.0	0.0

Begin Section!4
Begin curve !1
90.0	5.0	0.0
90.0	0.0	5.0
90.0	-5.0	0.0
90.0	5.0	0.0