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module hw2(S0,S1,S2,S3,C4,A0,A1,A2,A3,B0,B1,B2,B3,C0);
input A0,A1,A2,A3,B0,B1,B2,B3,C0;
output S0,S1,S2,S3,C4;
wire C1,C2,C3;
m1 U0 (.S(S0),.C(C1),.X(A0),.Y(B0),.Z(C0));
m1 U1 (.S(S1),.C(C2),.X(A1),.Y(B1),.Z(C1));
m1 U2 (.S(S2),.C(C3),.X(A2),.Y(B2),.Z(C2));
m1 U3 (.S(S3),.C(C4),.X(A3),.Y(B3),.Z(C3));
endmodule
module m1(X,Y,Z,S,C);
input X,Y,Z;
output S,C;
wire S,C;
assign S=(X^Y)^Z;
C=((X^Y)&Z)|(X&Y);
endmodule