// SPDX-License-Identifier: MIT
`timescale 1ns/1ps
module tb;
  logic value;
  initial begin
    value=1'bx; #1; $display("OBS ordinary=%b case_x=%0d unknown=%0d",value==1'bx,value===1'bx,$isunknown(value));
    $finish;
  end
endmodule