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module top(
input [8:0] a,
input [8:0] b,
output [8:0] o1,
output [2:0] o2,
input [2:0] c,
input [2:0] d,
output [2:0] o3,
output [2:0] o4,
input s
);
assign o1 = (s ? 0 : a + b);
assign o2 = (s ? a : a - b);
assign o3 = (s ? 4'b1111 : d + c);
assign o4 = (s ? d : c - d);
endmodule
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