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module decoder_3_8
(input [2:0] sel,
output reg [7:0] res);
always @(sel or res)
begin
case (sel)
3'b000 : res = 8'b00000001;
3'b001 : res = 8'b00000010;
3'b010 : res = 8'b00000100;
3'b011 : res = 8'b00001000;
3'b100 : res = 8'b00010000;
3'b101 : res = 8'b00100000;
3'b110 : res = 8'b01000000;
default : res = 8'b10000000;
endcase // case(sel)
end // always @ (sel or res)
endmodule // decoder_3_8
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