int red = 12 ,
int yellow = 6 ,
int green = 2 

void setup() {
  
  pinMode(red, OUTPUT);
  pinMode(yellow, OUTPUT);
  pinMode(GREEN, OUTPUT);
}


void loop() {
  digitalWrite(red, HIGH);
  delay(5000);          
  digitalWrite(red, LOW); 
  delay(100);             
  
  digitalWrite(yellow, HIGH);
  delay(800);
  digitalWrite(yellow, LOW);
  delay(100);

  digitalWrite(green, HIGH);   
  delay(1500);             
  digitalWrite(green, LOW);    
  delay(100);
  
  digitalWrite(yellow, HIGH);
  delay(800);
  digitalWrite(yellow, LOW);
  delay(100);
}