'Writing a circuit for a full adder using only AND, OR, and NOT

my full adder

I have an idea of what I am going for here. I have replaced the XOR gates and have linked up the first one but am extremely confused on what inputs I should be putting in the second one. I know that I need to link up the C_in (most likely in the not gate) but cannot see where I need to add the other three.



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