:for t1 from=1 to=4 step=1 do={
   :for t2 from=1 to=25 step=1 do={
     :beep frequency=540 length=33ms;
     :delay 33ms;
     :beep frequency=650 length=27ms;
     :delay 27ms;
   }
   :delay 2000ms;
 }