void setup() {
pinMode(8, OUTPUT);
pinMode(6, OUTPUT);
pinMode(7, OUTPUT);

}

void loop() {
      digitalWrite(8, HIGH);
      digitalWrite(6, LOW);
      delay(2000);
    digitalWrite(8, HIGH);
    digitalWrite(6, HIGH);
    delay(500);
  digitalWrite(7, HIGH);
  digitalWrite(8, LOW);
  digitalWrite(6, LOW);
  delay(3000);
  digitalWrite(7, HIGH);
delay(250);
digitalWrite(7,LOW); 
delay(250);
digitalWrite(7, HIGH);
delay(250);
digitalWrite(7,LOW); 
delay(250); 
digitalWrite(7, HIGH);
delay(250);
digitalWrite(7,LOW); 
delay(250); 
digitalWrite(7, HIGH);
delay(250);
digitalWrite(7,LOW); 
delay(250); 
digitalWrite(7, HIGH);
delay(250);
digitalWrite(7,LOW); 
delay(250); 
digitalWrite(7, HIGH);
delay(250);
digitalWrite(7,LOW); 
delay(250); 
digitalWrite(6, HIGH);
delay(500);

}