int led1=5;
int led2=7;
int led3=9;
int led4=11;
void setup() {

pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
pinMode(led4, OUTPUT);
}

void loop() {
digitalWrite(led3, HIGH);
delay(700);
digitalWrite(led1, HIGH);
delay(300);
digitalWrite(led2, HIGH);
delay(400);
digitalWrite(led4, HIGH);
delay(1000);

digitalWrite(led2, LOW);
delay(700);
digitalWrite(led4, LOW);
delay(500);
digitalWrite(led1, LOW);
delay(300);
digitalWrite(led3, LOW);
delay(400);
}