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

}



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

for(int i=8, j=7; i<=13, j>=2; i++, j--){
pinMode(i, OUTPUT);
pinMode(j, OUTPUT);

digitalWrite(i, HIGH);
digitalWrite(j, HIGH);
delay(200);
digitalWrite(i, LOW);
digitalWrite(j, LOW);
//delay(200);
}

}