int s[] - {15, 2, 4, 5, 18, 21, 19, 22};
void setup() {
 



 pinMode(s[0], OUTPUT);
 pinMode(s[1], OUTPUT);
 pinMode(s[2], OUTPUT);
 }

void loop() {
  digitalWrite(s[0], HIGH);
  digitalWrite(s[1], HIGH);
  digitalWrite(s[2], HIGH);
  
  delay(10); // this speeds up the simulation
}