int ledPin1 =  4;  
int ledPin2 =  8;
int ledState = LOW;
long previousMillis = 0; 
long interval = 1000; 

void setup() {
   pinMode(ledPin1, OUTPUT);
   pinMode(5, OUTPUT)   ;
   pinMode(6, OUTPUT);
   pinMode(7, OUTPUT);
   pinMode(8, OUTPUT);
   pinMode(9, OUTPUT);
   pinMode(10, OUTPUT);
   pinMode(11, OUTPUT);
}

void loop() {
  unsigned long currentMillis = millis();
 
  if(currentMillis - previousMillis > interval) {
     previousMillis = currentMillis;   
    if (ledState == LOW)
      ledState = HIGH;
    else
      ledState = LOW;
    digitalWrite(ledPin1, ledState);
    digitalWrite(ledPin2, ledState);
    if(ledState == LOW) {
       ledPin1++;
       ledPin2++;
    }
    if(ledPin1 == 8){
      ledPin1 = 4;
    }
    if(ledPin2 == 12){
      ledPin2 = 8;   
    } 
  }
  
}