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Can someone help? I don't understand this step:
"When you are tracing a line that goes behind another object just draw the whole line and delete unwanted parts later. To do this, draw 2 shapes like in image below and be sure that you draw green one last. Select both shapes and press ctrl and minus. This should remove the green shape and the parts of the black shape that were inside of the green one. This is called 'difference'."
So is he saying to use the bezier tool to make a green square around the area where it goes through it? I also pressed ctrl + minus, and nothing happened. Also when I tried it, my shape was filled with green.