#define PIN_LED      13

 #define PIN_RED      12
 #define PIN_YELLOW   11
 #define PIN_GREEN    10

 #define  PAUSE       500

 void setup() {
  // put your setup code here, to run once:

    pinMode(PIN_LED,    OUTPUT);
    pinMode(PIN_RED,    OUTPUT);
    pinMode(PIN_GREEN,  OUTPUT);
    pinMode(PIN_YELLOW, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
    digitalWrite(PIN_RED,    HIGH);
    digitalWrite(PIN_YELLOW, LOW);
    digitalWrite(PIN_GREEN,  LOW);
    for( int i = 0; i < 10; i++ ){
      digitalWrite(PIN_LED,    i & 1);
      delay( PAUSE );
    }
      

    digitalWrite(PIN_RED,    LOW);
    digitalWrite(PIN_YELLOW, HIGH);
    digitalWrite(PIN_GREEN,  LOW);
    for( int i = 0; i < 10; i++ ){
      digitalWrite(PIN_LED,    i & 1);
      delay( PAUSE );
    }
      

    digitalWrite(PIN_RED,    LOW);
    digitalWrite(PIN_YELLOW, LOW);
    digitalWrite(PIN_GREEN,  HIGH);
    for( int i = 0; i < 10; i++ ){
      digitalWrite(PIN_LED,    i & 1);
      delay( PAUSE );
    }
      

    digitalWrite(PIN_RED,    LOW);
    digitalWrite(PIN_YELLOW, HIGH);
    digitalWrite(PIN_GREEN,  LOW);
    for( int i = 0; i < 10; i++ ){
      digitalWrite(PIN_LED,    i & 1);
      delay( PAUSE );
    }
      

    digitalWrite(PIN_RED,    LOW);
    digitalWrite(PIN_YELLOW, LOW);
    digitalWrite(PIN_GREEN,  LOW);
    for( int i = 0; i < 10; i++ ){
      digitalWrite(PIN_LED,    i & 1);
      delay( PAUSE );
    }
      

    digitalWrite(PIN_RED,    LOW);
    digitalWrite(PIN_YELLOW, HIGH);
    digitalWrite(PIN_GREEN,  LOW);
    for( int i = 0; i < 10; i++ ){
      digitalWrite(PIN_LED,    i & 1);
      delay( PAUSE );
    }
      

    digitalWrite(PIN_RED,    LOW);
    digitalWrite(PIN_YELLOW, LOW);
    digitalWrite(PIN_GREEN,  LOW);
    for( int i = 0; i < 10; i++ ){
      digitalWrite(PIN_LED,    i & 1);
      delay( PAUSE );
    }
      

    digitalWrite(PIN_RED,    LOW);
    digitalWrite(PIN_YELLOW, HIGH);
    digitalWrite(PIN_GREEN,  LOW);
    for( int i = 0; i < 10; i++ ){
      digitalWrite(PIN_LED,    i & 1);
      delay( PAUSE );
    }
      

    digitalWrite(PIN_RED,    LOW);
    digitalWrite(PIN_YELLOW, LOW);
    digitalWrite(PIN_GREEN,  LOW);
    for( int i = 0; i < 10; i++ ){
      digitalWrite(PIN_LED,    i & 1);
      delay( PAUSE );
    }
      

}