void setup() {
pinMode(2, OUTPUT); // A
pinMode(3, OUTPUT); // B
pinMode(4, OUTPUT); // C

}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(2,1);
delay(10);
digitalWrite(2,0);
delay(10);

digitalWrite(3,1);
delay(10);
digitalWrite(3,0);
delay(10);



digitalWrite(4,1);
delay(10);
digitalWrite(4,0);
delay(10);

}