Move back the mask to the circle, then group the upper rectangles Ctrl+G then select this rectangles and the mask and hit Ctrl+7 to make the mask on the rectangles.
I try this step, but when I group the upper rectangles and the mask, then hit Ctrl+7, everything disappears. My rectangles are no longer visible. What can I do to make my image look like the one in Step 19?
Thanks
S
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