int L1=13;
int L2=12;
int L3=11;
int L4=10;
int L5=9;
int L6=8;
int R6=7;
int R5=6;
int R4=5;
int R3=4;
int R2=3;
int R1=2;

void setup() {

  // put your setup code here, to run once:
pinMode(L1, OUTPUT);
pinMode(L2, OUTPUT);
pinMode(L3, OUTPUT);
pinMode(L4, OUTPUT);
pinMode(L5, OUTPUT);
pinMode(L6, OUTPUT);
pinMode(R6, OUTPUT);
pinMode(R5, OUTPUT);
pinMode(R4, OUTPUT);
pinMode(R3, OUTPUT);
pinMode(R2, OUTPUT);
pinMode(R1, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:

digitalWrite(L1, HIGH);
digitalWrite(R1, HIGH);
delay(100);
digitalWrite(L2, HIGH);
digitalWrite(R2, HIGH);
delay(100);
digitalWrite(L3, HIGH);
digitalWrite(R3, HIGH);
delay(100);
digitalWrite(L4, HIGH);
digitalWrite(R4, HIGH);
delay(100);
digitalWrite(L5, HIGH);
digitalWrite(R5, HIGH);
delay(100);
digitalWrite(L6, HIGH);
digitalWrite(R6, HIGH);
delay(100);


digitalWrite(L1, LOW);
digitalWrite(R1, LOW);
delay(50);
digitalWrite(L2, LOW);
digitalWrite(R2, LOW);
delay(50);
digitalWrite(L3, LOW);
digitalWrite(R3, LOW);
delay(50);
digitalWrite(L4, LOW);
digitalWrite(R4, LOW);
delay(50);
digitalWrite(L5, LOW);
digitalWrite(R5, LOW);
delay(50);
digitalWrite(L6, LOW);
digitalWrite(R6, LOW);
delay(50);

}