int timedelay = 100;

void setup() {
  // put your setup code here, to run once:
  for (int i = 4; i <= 13; i++)
    pinMode(i, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  for (int i = 0; i <= 5; i++) {
    pat1();
  }
  for (int i = 0; i <= 5; i++) {
    pat2();
  }
}

void pat1() {
  for (int i = 4; i <= 13; i++) {
    digitalWrite(i, HIGH);
    delay(timedelay);
    digitalWrite(i, LOW); // Corrected this line
  }
}

void pat2() {
  for (int i = 4; i <= 13; i += 2) {
    digitalWrite(i, HIGH);
    delay(timedelay);
    digitalWrite(i, LOW); // Corrected this line
  }
  for (int i = 13; i >= 4; i -= 2) {
    digitalWrite(i, HIGH);
    delay(timedelay);
    digitalWrite(i, LOW); // Corrected this line
  }
}