#define led 2
#define led 4
#define led 7
#define led 9

void setup() {
  // put your setup code here, to run once:
pinMode(2, OUTPUT);
pinMode(4, OUTPUT);
pinMode(7, OUTPUT);
pinMode(9, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(2, HIGH);
digitalWrite(4, HIGH);
digitalWrite(7, HIGH);
digitalWrite(9, HIGH);
delay(1000);
digitalWrite(2,LOW);
digitalWrite(4, HIGH);
digitalWrite(7, HIGH);
digitalWrite(9, HIGH);
delay(1000);
digitalWrite(2, LOW);
digitalWrite(4, LOW);
digitalWrite(7, HIGH);
digitalWrite(9, HIGH);
delay(1000);
digitalWrite(2, LOW);
digitalWrite(4, LOW);
digitalWrite(7, LOW);
digitalWrite(9, HIGH);
delay(1000);
digitalWrite(2,LOW);
digitalWrite(4,LOW);
digitalWrite(7,LOW);
digitalWrite(9,LOW);
delay(1000);
}