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+
+module add2
+ #(parameter WIDTH=16)
+ (input [WIDTH-1:0] in1,
+ input [WIDTH-1:0] in2,
+ output [WIDTH-1:0] sum);
+
+ wire [WIDTH:0] sum_int = {in1[WIDTH-1],in1} + {in2[WIDTH-1],in2};
+ assign sum = sum_int[WIDTH:1]; // Note -- will have some bias
+
+endmodule // add2