/*void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}
*/
void setup() {
    //Put your setup code here, to run once:
    for (int i=9;i<14;i++)
    pinMode(i,OUTPUT);
      
      }

      void loop() {
      for(int l=9,r=13;r>=l;l++,r--)
      {
      digitalWrite(l,HIGH);
      digitalWrite(r,HIGH);
      delay(100);
      digitalWrite(l,LOW);
      digitalWrite(r,LOW);
      }

      for(int l=10,r=12;l>9;l--,r++)
      {
      digitalWrite(l,HIGH);
      digitalWrite(r,HIGH);
      delay(100);
      digitalWrite(l,LOW);
      digitalWrite(r,LOW);
      }
        
   //     }
}