//Blink 6 LEDs one after another 
//introducing arrays

int a;
int LEDseq[6]={2,1,5,0,3,4};

void setup()
{
   for(a=0;a<6;a++)
   {
      pinMode(a,OUTPUT);     //set the following pins as outputs
   }
}


void loop()
{
   for(a=0;a<6;a++)
   {
      digitalWrite(LEDseq[a], HIGH);
      delay(500);
      digitalWrite(LEDseq[a], LOW); 
   }
}