int led1 = 13;
int led2 = 12;
int led3 = 11;
int led4 = 10;
int led5 = 9;
int led6 = 8;
int led7 = 7;
int led8 = 6;

void setup() {
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(led5, OUTPUT);
  pinMode(led6, OUTPUT);
  pinMode(led7, OUTPUT);
  pinMode(led8, OUTPUT);
  
}

void loop() {

// +====== wave ======+

  digitalWrite(led1, HIGH);
  delay(100);
  digitalWrite(led2, HIGH);
  delay(100);
  digitalWrite(led3, HIGH);
  delay(100);
  digitalWrite(led4, HIGH);
  delay(100);
  digitalWrite(led5, HIGH);
  delay(100);
  digitalWrite(led6, HIGH);
  delay(100);
  digitalWrite(led7, HIGH);
  delay(100);
  digitalWrite(led8, HIGH);
  delay(100);
  digitalWrite(led8, LOW);
  delay(100);
  digitalWrite(led7, LOW);
  delay(100);
  digitalWrite(led6, LOW);
  delay(100);
  digitalWrite(led5, LOW);
  delay(100);
  digitalWrite(led4, LOW);
  delay(100);
  digitalWrite(led3, LOW);
  delay(100);
  digitalWrite(led2, LOW);
  delay(100);
  digitalWrite(led1, LOW);
  delay(100);



// +====== Alternate ======+

  // digitalWrite(led1, HIGH);
  // delay(100);
  // digitalWrite(led1, LOW);
  // delay(100);
  // digitalWrite(led2, HIGH);
  // delay(100);
  // digitalWrite(led2, LOW);
  // delay(100);
  // digitalWrite(led3, HIGH);
  // delay(100);
  // digitalWrite(led3, LOW);
  // delay(100);
  // digitalWrite(led4, HIGH);
  // delay(100);
  // digitalWrite(led4, LOW);
  // delay(100);
  // digitalWrite(led5, HIGH);
  // delay(100);
  // digitalWrite(led5, LOW);
  // delay(100);
  // digitalWrite(led6, HIGH);
  // delay(100);
  // digitalWrite(led6, LOW);
  // delay(100);
  // digitalWrite(led7, HIGH);
  // delay(100);
  // digitalWrite(led7, LOW);
  // delay(100);
  // digitalWrite(led8, HIGH);
  // delay(100);
  // digitalWrite(led8, LOW);
  // delay(100);



// +====== Long ver ======+

    // digitalWrite(led1, HIGH);
    // digitalWrite(led2, LOW);
    // digitalWrite(led3, LOW);
    // digitalWrite(led4, LOW);
    // digitalWrite(led5, LOW);
    // digitalWrite(led6, LOW);
    // digitalWrite(led7, LOW);
    // digitalWrite(led8, LOW);
    // delay(200);

    // digitalWrite(led1, LOW);
    // digitalWrite(led2, HIGH);
    // digitalWrite(led3, LOW);
    // digitalWrite(led4, LOW);
    // digitalWrite(led5, LOW);
    // digitalWrite(led6, LOW);
    // digitalWrite(led7, LOW);
    // digitalWrite(led8, LOW);
    // delay(200);

    // digitalWrite(led1, LOW);
    // digitalWrite(led2, LOW);
    // digitalWrite(led3, HIGH);
    // digitalWrite(led4, LOW);
    // digitalWrite(led5, LOW);
    // digitalWrite(led6, LOW);
    // digitalWrite(led7, LOW);
    // digitalWrite(led8, LOW);
    // delay(200);

    // digitalWrite(led1, LOW);
    // digitalWrite(led2, LOW);
    // digitalWrite(led3, LOW);
    // digitalWrite(led4, HIGH);
    // digitalWrite(led5, LOW);
    // digitalWrite(led6, LOW);
    // digitalWrite(led7, LOW);
    // digitalWrite(led8, LOW);
    // delay(200);

    // digitalWrite(led1, LOW);
    // digitalWrite(led2, LOW);
    // digitalWrite(led3, LOW);
    // digitalWrite(led4, LOW);
    // digitalWrite(led5, HIGH);
    // digitalWrite(led6, LOW);
    // digitalWrite(led7, LOW);
    // digitalWrite(led8, LOW);
    // delay(200);

    // digitalWrite(led1, LOW);
    // digitalWrite(led2, LOW);
    // digitalWrite(led3, LOW);
    // digitalWrite(led4, LOW);
    // digitalWrite(led5, LOW);
    // digitalWrite(led6, HIGH);
    // digitalWrite(led7, LOW);
    // digitalWrite(led8, LOW);
    // delay(200);

    // digitalWrite(led1, LOW);
    // digitalWrite(led2, LOW);
    // digitalWrite(led3, LOW);
    // digitalWrite(led4, LOW);
    // digitalWrite(led5, LOW);
    // digitalWrite(led6, LOW);
    // digitalWrite(led7, HIGH);
    // digitalWrite(led8, LOW);
    // delay(200);

    // digitalWrite(led1, LOW);
    // digitalWrite(led2, LOW);
    // digitalWrite(led3, LOW);
    // digitalWrite(led4, LOW);
    // digitalWrite(led5, LOW);
    // digitalWrite(led6, LOW);
    // digitalWrite(led7, LOW);
    // digitalWrite(led8, HIGH);
    // delay(200);

}