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module main;
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reg [11:0] sum;
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wire [10:0] a = 11'b111_0000_0000;
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wire [10:0] b = 11'b000_0000_1111;
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initial begin
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#1 sum = $signed(a) + $signed(b);
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if (sum == 12'b1111_0000_1111)
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$display("PASSED");
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else
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$display("failed: %b",sum);
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$finish;
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end
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endmodule
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