How to animate in a loop with no pause?


I'm doing an simple animation in flash.
It's just a long picture moving from left to right using motion tween, however, I would like to loop this movie clip with no pause. Meaning, when it comes to the end of the picture, the same picture will continue to move with no pause. This clip will be keep looping very smoothly. How do I do so?
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If you don't like to screw around with actionscript there is a very simple trick to do it:

Just create a symbol with 2 instances of the picture. They sould be side by side, let's say "glued" to each other.
Then, just animate the symbol from a side to another, making so that the last frame makes the right side picture at the same position (or to be exact, almost the same) than the left side picture on the first frame.

You can adjust the diference so that it runs smoothly, because if the first and last are exactly the same it will have two consecutive frames at the same position and it will look like it stopped for a millisecond

I've tried solutions with actionscript, but this is more simple.
I use this a lot with 360º pictures.
Hope you get it, if you don't I could send you a sample

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