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The "Transparent mask" effect

This effect is the combination of  the "Create a mask" command and "Associate Bezier" command :

First, create a background.

Then draw 3 forms that overlap on the background.
Select each form and launch "Curves" -> "Convert into curves"
 

Now select all the forms (without the background) and launch "Curves" -> Associate Bezier".
At last, select all the elements and execute "Create a mask".

All the areas that have lost the background image are now transparent : you can verify it by lacing a colored element under it.
 
 
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