Figure P4.3 shows a modified version of the code for a 2-to-4 decoder in Figure 4.37. This code is almost correct but contains one error. What is the error?

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module dec2t04 (W, En, Y); input [1:0] W; input En; output reg [0:3] Y; integer k; always @(W, En) for (k = 0; k<= 3; k=k+1) if (W == k) Y[k] = En; endmodule