void setup() {
  pinMode(7, OUTPUT); // put your setup code here, to run once
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  {

  void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(7, HIGH);
  Serial.println("green is on");
  delay(600);
  digitalWrite(7, LOW);
  Serial.println("green is off");
  digitalWrite(8, HIGH);
  Serial.println("yellow is on");
  delay(600);
  digitalWrite(8,LOW);
  Serial.println("yellow is off");
  digitalWrite(9, HIGH);
  Serial.println("red is on");
  delay(1800);
  digitalWrite(8, HIGH);
  Serial.println("yellow is on");
  delay(400);
  digitalWrite(9, LOW);
  Serial.println("red is off");
  digitalWrite(9, LOW);
  Serial.println("yellow is off");
  
}