How do you plan to solve it?
module sr_latch_nor ( input S, input R, output reg Q, output reg Qn ); always @(*) begin if (S && R) begin Q = 1'b0; Qn = 1'b1; end else if (S && !R) begin Q = 1'b1; Qn = 1'b0; end else if (!S && R) begin Q = 1'b0; Qn = 1'b1; end end endmodule