void setup() {
 pinMode(2,OUTPUT);
 pinMode(4, OUTPUT);
 pinMode(5, OUTPUT);
 pinMode(18, OUTPUT);
 pinMode(19, OUTPUT);
 pinMode(21, OUTPUT);
 pinMode(22, OUTPUT);
 pinMode(23, OUTPUT);
 pinMode(25, OUTPUT);
 pinMode(26, OUTPUT);
}

void loop() {
  digitalWrite(2, HIGH);
delay(50);
digitalWrite(4, HIGH);
delay(50);
digitalWrite(5, HIGH);
delay(50);
digitalWrite(18, HIGH);
delay(50);
digitalWrite(19, HIGH);
delay(50);
digitalWrite(21, HIGH);
delay(50);
digitalWrite(22, HIGH);
delay(50);
digitalWrite(23, HIGH);
delay(50);
digitalWrite(25, HIGH);
delay(50);
digitalWrite(26, HIGH);
delay(50);
digitalWrite(2, LOW);
delay(50);
digitalWrite(4,LOW );
delay(50);
digitalWrite(5, LOW);
delay(50);
digitalWrite(18,LOW);
delay(50);
digitalWrite(19,LOW );
delay(50);
digitalWrite(21,LOW );
delay(50);
digitalWrite(22,LOW );
delay(50);
digitalWrite(23,LOW );
delay(50);
digitalWrite(25, LOW);
delay(50);
digitalWrite(26, LOW);
delay(50);

}