void setup() {
  // put your setup code here, to run once:
pinMode(8,OUTPUT); // using the board Red LED connected to pin 8 to blink
pinMode(9,OUTPUT); // using the board Yellow LED connected to pin 9 to blink
pinMode(10,OUTPUT); // using the board Blue LED connected to pin 10 to blink
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(8,HIGH); // RED LED to blink for 20 sec intervals for 3 times
delay(200);
digitalWrite(8,LOW);
delay(200);
digitalWrite(8,HIGH);
delay(200);
digitalWrite(8,LOW);
delay(200);
digitalWrite(8,HIGH);
delay(200);
digitalWrite(8,LOW);
delay(500);  // delay between 2 LEDs
digitalWrite(9,HIGH); // Yellow LED to blink for 20 sec intervals for 5 times
delay(200);
digitalWrite(9,LOW);
delay(200);
digitalWrite(9,HIGH); 
delay(200);
digitalWrite(9,LOW);
delay(200);
digitalWrite(9,HIGH); 
delay(200);
digitalWrite(9,LOW);
delay(200);
digitalWrite(9,HIGH); 
delay(200);
digitalWrite(9,LOW);
delay(200);
digitalWrite(9,HIGH); 
delay(200);
digitalWrite(9,LOW);
delay(500);  // delay between 2 LEDs
digitalWrite(10,HIGH); // Blue LED to blink for 20 sec intervals for 7 times
delay(200);
digitalWrite(10,LOW);
delay(200);
digitalWrite(10,HIGH); 
delay(200);
digitalWrite(10,LOW);
delay(200);
digitalWrite(10,HIGH); 
delay(200);
digitalWrite(10,LOW);
delay(200);
digitalWrite(10,HIGH); 
delay(200);
digitalWrite(10,LOW);
delay(200);
digitalWrite(10,HIGH); 
delay(200);
digitalWrite(10,LOW);
delay(200);
digitalWrite(10,HIGH); 
delay(200);
digitalWrite(10,LOW);
delay(200);
digitalWrite(10,HIGH); 
delay(200);
digitalWrite(10,LOW);
delay(500); // delay between 2 LEDs

}