void setup() {  // initialize digital pin 13 as an output.
   pinMode(2, OUTPUT);
   pinMode(3, OUTPUT);
   pinMode(4, OUTPUT);
   pinMode(5, OUTPUT);
   pinMode(6, OUTPUT);
   }

   // the loop function runs over and over again forever

   void loop() {
      digitalWrite(2, HIGH); // turn the LED on (HIGH is the voltage level)
         delay(100); // wait for a second
            digitalWrite(2, LOW); // turn the LED off by making the voltage LOW
               delay(100); // wait for a second
             
             
               
      digitalWrite(3, HIGH); // turn the LED on (HIGH is the voltage level)
         delay(100); // wait for a second
            digitalWrite(3, LOW); // turn the LED off by making the voltage LOW
               delay(100);
               digitalWrite(4, HIGH); // turn the LED on (HIGH is the voltage level)
                  delay(100); // wait for a second
                     digitalWrite(4, LOW); // turn the LED off by making the voltage LOW
                        delay(100); //  // wait for a second
            digitalWrite(5, HIGH); // turn the LED on (HIGH is the voltage level)
               delay(100); // wait for a second
                  digitalWrite(5, LOW); // turn the LED off by making the voltage LOW
                
              delay(100);
              digitalWrite(6, HIGH); // turn the LED on (HIGH is the voltage level)
                 delay(100); // wait for a second
                    digitalWrite(6, LOW); // turn the LED off by making the voltage LOW
                       delay(100); 
            
               }