module comparator2Bit(
    input wire[1:0] a, b,
    output wire eq
);
wire[3:0] s;
assign s[0] = ~a[1] & ~a[0] & ~b[1] & ~b[0];
assign s[1] = ~a[1] &  a[0] & ~b[1] &  b[0];
assign s[2] =  a[1] & ~a[0] &  b[1] & ~b[0];
assign s[3] =  a[1] &  a[0] &  b[1] &  b[0];
assign eq = s[0] | s[1] | s[2] | s[3];
endmodule