function main(){
   putBeeper();
   putBeeperLine();
   goBack();
   turnRight();
   putBeeperLine();
   turnRight();
   move();
}

function putBeeperLine(){
   while (frontIsClear()) {
      move();
      move();
      putBeeper();
   }
}

function goBack(){
   turnLeft();
   turnLeft();

   while (frontIsClear()){
      move();
   }
}

function turnRight(){
   turnLeft();
   turnLeft();
   turnLeft();
}