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A full adder can be built from 2 half adders and an OR gate. The following verilog code show a hierarchical description of such a full-adder built from 2 half adders and an OR gate. Fill in the blanks. module half_adder(x, y,s, c);

input x, y;
output s, c;
xor(s, x,y);
and(c, x,y);
endmodule
//Full adder verilog module
//a, b, cin(carry-in) are the inputs to the full adder
//s(sum) and cout(carry out) are the outputs of the full adder
//The sum of half adder1 is s1 and carry is c1
//The sum of half adder2 is s and carry is c2
module full_adder(a, b,cin, s,cout);
input a, b,cin;
output s, cout;
wire s1,c1,c2;
half_adder ha1(a, b,(),c1);
half_adder ha2(cin, s1,s,());
or((),c1,c2);
endmodule

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A full adder can be built from 2 half adders and an OR gate. The following verilog code show a hiera...
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