int led1= 2;
int led2= 3;
int led3= 4;
int led4= 5;
int led5= 6;
int led6= 7;
int led7= 8;
int led8= 9;
int led9= 10;
int led10= 11;
int led11= 12;

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);
  pinMode(led10, OUTPUT);
  pinMode(led11, OUTPUT);
  
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(led1, HIGH);
  digitalWrite(led2, LOW);
  digitalWrite(led3, HIGH);
  digitalWrite(led4, LOW);
  digitalWrite(led5, HIGH);
  digitalWrite(led6, LOW);
  digitalWrite(led7, HIGH);
  digitalWrite(led8, LOW);
  digitalWrite(led9, HIGH);
  digitalWrite(led10, LOW);
  digitalWrite(led11, HIGH);
  

  delay(300);

  digitalWrite(led1, LOW);
  digitalWrite(led2, HIGH);
  digitalWrite(led3, LOW);
  digitalWrite(led4, HIGH);
  digitalWrite(led5, LOW);
  digitalWrite(led6, HIGH);
  digitalWrite(led7, LOW);
  digitalWrite(led8, HIGH);
  digitalWrite(led9, LOW);
  digitalWrite(led10, HIGH);
  digitalWrite(led11, LOW);

  delay(300);
}