module adder2 (A, B, Ci, S, Co);

input[1:0] A;
input[1:0] B;
input Ci;
output[1:0] S;
output Co;
wire[2:0] Sum5;
assign Sum5 = A + B + Ci ;
assign S = Sum5[1:0] ;
assign Co = Sum5[2] ;
endmodule