void setup() {
 Serial.begin(115200);
pinMode(13,OUTPUT);
pinMode(14,OUTPUT);
pinMode(12,OUTPUT);
pinMode(15,OUTPUT);
pinMode(2,OUTPUT);
pinMode(4,OUTPUT);
}

void loop() {
digitalWrite(13,HIGH);
digitalWrite(15,HIGH);
delay(1000);
digitalWrite(13,LOW);
digitalWrite(15,LOW);
delay(1000);
digitalWrite(14,HIGH);
digitalWrite(2,HIGH);
delay(1000);
digitalWrite(14,LOW);
digitalWrite(2,LOW);
delay(1000);
digitalWrite(12,HIGH);
digitalWrite(4,HIGH);
delay(1000);
digitalWrite(12,LOW);
digitalWrite(4,LOW);
delay(1000);
}