#define LED 2

void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(2, OUTPUT); //RED
  pinMode(21, OUTPUT); //YELLOW
  pinMode(4, OUTPUT); //GREEN
  pinMode(19, OUTPUT); //RED2
  pinMode(18, OUTPUT); //YELLOW2
  pinMode(5, OUTPUT); //GREEN2
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(2, HIGH);  //RED
  digitalWrite(5, HIGH);  //GREEN
  digitalWrite(21, LOW);   // turn the LED off by making the voltage LOW
  digitalWrite(4, LOW);   // turn the LED off by making the voltage LOW
  digitalWrite(19, LOW);   // turn the LED off by making the voltage LOW
  digitalWrite(18, LOW);   // turn the LED off by making the voltage LOW
  delay(5000);                      // wait for a second
  digitalWrite(2,HIGH);   // turn the LED off by making the voltage LOW
  digitalWrite(5, LOW);   // turn the LED off by making the voltage LOW
  digitalWrite(21, LOW);   // turn the LED off by making the voltage LOW
  digitalWrite(4, LOW);   // turn the LED off by making the voltage LOW
  digitalWrite(19, LOW);   // turn the LED off by making the voltage LOW
  digitalWrite(18,HIGH);  // turn the LED on (HIGH is the voltage level)
  delay(3000);     // wait for a second
  digitalWrite(19, HIGH);  // turn the LED on (HIGH is the voltage level)        
  digitalWrite(4, HIGH);  // turn the LED on (HIGH is the voltage level)
  digitalWrite(21, LOW);   // turn the LED off by making the voltage LOW
  digitalWrite(2, LOW);   // turn the LED off by making the voltage LOW
  digitalWrite(5, LOW);   // turn the LED off by making the voltage LOW
  digitalWrite(18, LOW);   // turn the LED off by making the voltage LOW
  delay(5000);                      // wait for a seconddigitalWrite(2, HIGH);  // turn the LED on (HIGH is the voltage level)
  digitalWrite(21, HIGH);  // turn the LED on (HIGH is the voltage level)
  digitalWrite(18, LOW);   // turn the LED off by making the voltage LOW
  digitalWrite(5, LOW);   // turn the LED off by making the voltage LOW
  digitalWrite(4, LOW);   // turn the LED off by making the voltage LOW
  digitalWrite(19,HIGH);   // turn the LED off by making the voltage LOW
  digitalWrite(2, LOW);   // turn the LED off by making the voltage LOW
  delay(3000);                      // wait for a second
}