int Red = 0;
int yellow = 2;
int Green = 4;
int Blue = 16;

void setup() {
pinMode(Red,OUTPUT);
pinMode(yellow,OUTPUT);
pinMode(Green,OUTPUT);
pinMode(Blue,OUTPUT);
}

void loop() {
  digitalWrite(Red,HIGH );
  digitalWrite(yellow,HIGH );
 delay(1000);
   digitalWrite(Red,LOW );
  digitalWrite(yellow,LOW );
   delay(1000);
   digitalWrite(Green,HIGH );
  digitalWrite(Blue,HIGH );
   delay(1000);
      digitalWrite(Green,LOW );
  digitalWrite(Blue,LOW );
  delay(1000);
}