Question: This is what my 4 bit full adder looks like. Use multiplexers and inverters to expand this adder to an adder / subtractor . Please

This is what my 4 bit full adder looks like. Use multiplexers and inverters to expand this adder to an adder/subtractor. Please DRAW the new schematic, no code please. When drawing the adder/subtractor, please redraw the 4 bit schematic as shown in the image. I want to be able to see all of the gates, and not just a box that says "full bit adder". Thank you.
This is what my 4 bit full adder looks like. Use

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