void setup() {
  pinMode(2,OUTPUT);
  pinMode(3,OUTPUT);
  pinMode(4,OUTPUT);
  pinMode(5,OUTPUT);
  pinMode(6,OUTPUT);
  pinMode(7,OUTPUT);
  pinMode(8,OUTPUT);
  pinMode(9,OUTPUT);
  pinMode(10,OUTPUT);
  pinMode(11,OUTPUT);
  pinMode(12,OUTPUT);
  pinMode(13,OUTPUT);
}
void loop() {
digitalWrite(2,1);
delay(50);
digitalWrite(2,0);
digitalWrite(3,1);
delay(50);
digitalWrite(3,0);
digitalWrite(4,1);
delay(50);
digitalWrite(4,0);
digitalWrite(5,1);
delay(50);
digitalWrite(5,0);
digitalWrite(6,1);
delay(50);
digitalWrite(6,0);
digitalWrite(7,1);
delay(50);
digitalWrite(7,0);
digitalWrite(8,1);
delay(50);
digitalWrite(8,0);
digitalWrite(9,1);
delay(50);
digitalWrite(9,0);
digitalWrite(10,1);
delay(50);
digitalWrite(10,0);
digitalWrite(11,1);
delay(50);
digitalWrite(11,0);
digitalWrite(12,1);
delay(50);
digitalWrite(12,0);
digitalWrite(13,1);
delay(50);
digitalWrite(13,0);
}