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/usr/lib/xtrkcad/demos/dmstrtrk.xtr is in xtrkcad 1:4.0.2-2ubuntu1.

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VERSION 2
DEMOINIT
ORIG 8.000 0.000 0.000
REDRAW
RESET
MESSAGE
Straight tracks are created by selecting the first End-Point of the track.
END
STEP
COMMAND Straight
MOUSE 2 6.833 3.667
MESSAGE
_________________________________________

Then the other End-Point is dragged to its final postion.
END
PAUSE 2000
MOUSE 3 6.833 3.750
MOUSE 3 36.000 9.667
MESSAGE
_________________________________________

The left mouse button is released at the final end postion.
END
BIGPAUSE
MOUSE 4 36.000 9.667
MESSAGE
=========================================
END
STEP
CLEAR