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This is exacly what I did:

Went and created a new Actionscript 3 project.
I drew 2 circles with the tool that draws circles :P
Then I went to frame 50, pressed F6 to add a frame.
Then I deleted...

Here, I put it on the internet, so no need to download.

http://hereitis.6te.net/

See how when the 2 black circles hit eachother, the part touching eachother turns transparent.

I am having a problem with Shape Overlapping, I am not sure if thats what it is called, but thats what I am going to call it.

When 2 Shapes hit eachother, the part that hit eachother will turn...