more replication

Given five 1-bit signals (a, b, c, d, and e), compute all 25 pairwise one-bit comparisons in the 25-bit output vector. The output should be 1 if the two bits being compared are equal.
out[24] = ~a ^ a; // a == a, so out[24] is always 1.
out[23] = ~a ^ b;
out[22] = ~a ^ c;
...
out[ 1] = ~e ^ d;
out[ 0] = ~e ^ e;

实现代码如下：

module top_module (
    input a, b, c, d, e,
    output [24:0] out );//
    /*wire [24:0]dingbu;
    wire [24:0]dibu;
    assign dingbu={a,a,a,a,a,b,b,b,b,b,c,c,c,c,c,d,d,d,d,d,e,e,e,e,e};
    assign dibu={a,b,c,d,e,a,b,c,d,e,a,b,c,d,e,a,b,c,d,e,a,b,c,d,e};
	assign out=~dingbu^dibu;*/
    assign out=~{{5{a}},{5{b}},{5{c}},{5{d}},{5{e}}}^{5{a,b,c,d,e}};

endmodule