int r1 = 1;
int y1 = 2;
int g1 = 3;
int r2 = 4;
int y2 = 5;
int g2 = 6;
int r3 = 7;
int y3 = 8;
int g3 = 9;

void setup() {
  // put your setup code here, to run once:
  pinMode(1, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  //red - red - green
  digitalWrite(r1,HIGH);
  digitalWrite(r2,HIGH);
  digitalWrite(g3,HIGH);
  digitalWrite(y1,LOW);
  digitalWrite(y2,LOW);
  digitalWrite(y3,LOW);
  digitalWrite(g1,LOW);
  digitalWrite(g2,LOW);
  digitalWrite(r3,LOW);
  delay(30000);

  // red - red - yellow
  digitalWrite(r1,HIGH);
  digitalWrite(r2,HIGH);
  digitalWrite(y3,HIGH);
  digitalWrite(y1,LOW);
  digitalWrite(y2,LOW);
  digitalWrite(g3,LOW);
  digitalWrite(g1,LOW);
  digitalWrite(g2,LOW);
  digitalWrite(r3,LOW);
  delay(3000);

  // red - green - red
  digitalWrite(r1,HIGH);
  digitalWrite(r3,HIGH);
  digitalWrite(g2,HIGH);
  digitalWrite(y1,LOW);
  digitalWrite(y2,LOW);
  digitalWrite(y3,LOW);
  digitalWrite(g1,LOW);
  digitalWrite(g3,LOW);
  digitalWrite(r2,LOW);
  delay(30000);

  // red - yellow - red
  digitalWrite(r1,HIGH);
  digitalWrite(r3,HIGH);
  digitalWrite(y2,HIGH);
  digitalWrite(y1,LOW);
  digitalWrite(y3,LOW);
  digitalWrite(g3,LOW);
  digitalWrite(g1,LOW);
  digitalWrite(g2,LOW);
  digitalWrite(r2,LOW);
  delay(3000);

  // green - red - red
  digitalWrite(r2,HIGH);
  digitalWrite(r3,HIGH);
  digitalWrite(g1,HIGH);
  digitalWrite(y1,LOW);
  digitalWrite(y3,LOW);
  digitalWrite(y2,LOW);
  digitalWrite(g3,LOW);
  digitalWrite(g2,LOW);
  digitalWrite(r1,LOW);
  delay(3000);
  
  // yellow - red - red
  digitalWrite(r2,HIGH);
  digitalWrite(r3,HIGH);
  digitalWrite(y1,HIGH);
  digitalWrite(y2,LOW);
  digitalWrite(y3,LOW);
  digitalWrite(g1,LOW);
  digitalWrite(g3,LOW);
  digitalWrite(g2,LOW);
  digitalWrite(r1,LOW);
  delay(3000);

  digitalWrite(r2,LOW);
  digitalWrite(r3,LOW);
  digitalWrite(g1,LOW);
  digitalWrite(y1,LOW);
  digitalWrite(y3,LOW);
  digitalWrite(y2,LOW);
  digitalWrite(g3,LOW);
  digitalWrite(g2,LOW);
  digitalWrite(r1,LOW);
  delay(1000);
  
  // Laboratory activity 2 and 3

  
  
}