int led1 = 13;
int led2 = 12;
int led3 = 11;
int led4 = 10;
int led5 = 9;
int led6 = 8;
int led7 = 7;
int led8 = 6;
int led9 = 5;

void setup()
{
  // put your setup code here, to run once:


pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
pinMode(led4, OUTPUT);
pinMode(led5, OUTPUT);
pinMode(led6, OUTPUT);
pinMode(led7, OUTPUT);
pinMode(led8, OUTPUT);
pinMode(led9, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
// 1
digitalWrite(led3, HIGH); digitalWrite(led6, HIGH); digitalWrite(led7, HIGH);
delay(5000); 
digitalWrite(led7, LOW);
digitalWrite(led6, LOW);

digitalWrite(led5, HIGH); digitalWrite(led8, HIGH);
delay(1000);
digitalWrite(led5, LOW); digitalWrite(led8, LOW);

//2
digitalWrite(led3, HIGH); digitalWrite(led4, HIGH); digitalWrite(led9, HIGH);
delay(5000); 
digitalWrite(led4, LOW);
digitalWrite(led3, LOW);


digitalWrite(led2, HIGH);digitalWrite(led5, HIGH); 
delay(1000);
digitalWrite(led2, LOW);digitalWrite(led5, LOW); 

//3
digitalWrite(led1, HIGH); digitalWrite(led6, HIGH); digitalWrite(led9, HIGH);
delay(5000); 
digitalWrite(led1, LOW);
digitalWrite(led9, LOW);

digitalWrite(led2, HIGH); digitalWrite(led8, HIGH);
delay(1000);
digitalWrite(led2, LOW); digitalWrite(led8, LOW);
}