found a bug on draw command

[nitrofurano]

Code:

10 cls:out 254,6

12 let x1=60:let y1=60
14 let x2=70:let y2=50
16 plot x1,192-y1
18 draw x2-x1,y1-y2

22 let x1=80:let y1=60
24 let x2=90:let y2=70
26 plot x1,192-y1
28 draw x2-x1,y1-y2

30 pause 0

this code should draw two lines, not one line and one dot...