int  RED1;
  int  RED2;
  int  YELLOW1;
  int  YELLOW2;
  int GREEN;

void setup() {
    RED1 = 2;
    RED2 = 3;
    YELLOW1 = 10;
    YELLOW2 = 11;
    GREEN = 7;
  pinMode (RED1, OUTPUT);
  pinMode (RED2, OUTPUT);
  pinMode (YELLOW1, OUTPUT);
  pinMode (YELLOW2, OUTPUT);
  pinMode (GREEN, OUTPUT);

}

void loop() {
  red1();
  red2();
}

//RED1
  void red1();
  digitalWrite(red1,HIGH);
  delay(500);
  digitalWrite(red1,LOW);
  delay(500);
  }
//RED2
  void red2(){
  digitalWrite(red2,HIGH);
  delay(500);
  digitalWrite(red2,LOW);
  delay(500);
  }
//  YELLOW1
  void yellow1(){
  digitalWrite(yellow1,HIGH);
  delay(500);
  digitalWrite(yellow1,LOW);
  delay(500);
  }
//  YELLOW2
  void yellow1(){
  digitalWrite(yellow2,HIGH);
  delay(500);
  digitalWrite(yellow2,LOW);
  delay(500);
  }
//  GREEN
  void green(){
  digitalWrite(green,HIGH);
  delay(500);
  digitalWrite(green,LOW);
  delay(500);
  }