void setup() 
{
 pinMode(2, OUTPUT);
 pinMode(7, OUTPUT);
 pinMode(5, OUTPUT);
 pinMode(6, OUTPUT);
 pinMode(8, OUTPUT);
 pinMode(9, OUTPUT);
}
void loop() 
 {
 digitalWrite(2, HIGH);
 digitalWrite(7, LOW);
 digitalWrite(5, LOW);
 digitalWrite(6, LOW);
 digitalWrite(8, LOW);
 digitalWrite(9, LOW);
 delay(500);
 digitalWrite(2, LOW);
 digitalWrite(7, HIGH);
 digitalWrite(5, HIGH);
 digitalWrite(6, LOW);
 digitalWrite(8, LOW);
 digitalWrite(9, LOW);
 delay(500);
 digitalWrite(2, LOW);
 digitalWrite(7, LOW);
 digitalWrite(5, LOW);
 digitalWrite(6, HIGH);
 digitalWrite(8, HIGH);
 digitalWrite(9, HIGH);
 delay(500);
 digitalWrite(2, HIGH);
 digitalWrite(7, HIGH);
 digitalWrite(5, HIGH);
 digitalWrite(6, HIGH);
 digitalWrite(8, HIGH);
 digitalWrite(9, HIGH);
 delay(3000);
 }