66. Demultiplexer

How do you plan to solve it?

module demux1to4(input d,input [1:0]s,output [3:0]y);
    assign y[0]=d&~s[1]&~s[0];
    assign y[1]=d&~s[1]&s[0];
    assign y[2]=d&s[1]&~s[0];
    assign y[3]=d&s[1]&s[0];
endmodule