c.v

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module Tf;
reg clock;
parameter off=0;

task light;
  output color;
  parameter size=32;
  input [(size-1):0] tics;
  begin
    repeat (tics) @(posedge clock);
    color = off;
  end
endtask
function [31:0] factorial;
  input [3:0] operand;
  reg [3:0] i;
  begin
     factorial = 1;
     for(i=2;i<=operand;i=i+1)
           factorial = i* factorial;
  end
endfunction

endmodule