// LED chaser
void setup ()

{
 pinMode(13, OUTPUT);
 pinMode(12, OUTPUT);
 pinMode(8,OUTPUT);
 pinMode(7,OUTPUT);
 pinMode(4,OUTPUT);
 pinMode(4,OUTPUT);
 }
 void loop()
 {
   digitalWrite(13, HIGH);
   delay(1000);
   digitalWrite(13, LOW);
   delay(1000);
   
   digitalWrite(12, HIGH);
   delay(1000);
   digitalWrite(12, LOW);
   delay(1000);
   }