Full 4 bits adder with the first 4 bits number under the 6, the second under the 7, the result above the 9. (only counting violet y when you have the maximum of them and when they're all above a 9).
This is preconfigured with 1111+0001 witch give 10000 witch is why the W is there. This system work for any numbers but you can get stuck if you're dumb.
Don't forget to move the W if you want to test others numbers. Feel free to try making a full 5 bits adder.
