#define L0 15
#define L1 2
#define L2 4
#define L3 16
#define L4 17
#define L5 5
#define L6 18
#define L7 19
#define L8 21
#define L9 22

void setup() {
  pinMode(L0, OUTPUT);
  pinMode(L1, OUTPUT);
  pinMode(L2, OUTPUT);
  pinMode(L3, OUTPUT);
  pinMode(L4, OUTPUT);
  pinMode(L5, OUTPUT);
  pinMode(L6, OUTPUT);
  pinMode(L7, OUTPUT);
  pinMode(L8, OUTPUT);  
  pinMode(L9, OUTPUT);
}

void loop() {
digitalWrite(L0, 0);
  digitalWrite(L1, 0);
  digitalWrite(L2, 0);
  digitalWrite(L3, 0);
  digitalWrite(L4, 0);
  digitalWrite(L5, 0);
  digitalWrite(L6, 0);
  digitalWrite(L7, 0);
  digitalWrite(L8, 1);
  digitalWrite(L9, 1);
  delay(500);
  digitalWrite(L0, 0);
  digitalWrite(L1, 0);
  digitalWrite(L2, 0);
  digitalWrite(L3, 0);
  digitalWrite(L4, 0);
  digitalWrite(L5, 0);
  digitalWrite(L6, 1);
  digitalWrite(L7, 1);
  digitalWrite(L8, 1);
  digitalWrite(L9, 1);
  delay(500);
  digitalWrite(L0, 0);
  digitalWrite(L1, 0);
  digitalWrite(L2, 1);
  digitalWrite(L3, 1);
  digitalWrite(L4, 1);
  digitalWrite(L5, 1);
  digitalWrite(L6, 1);
  digitalWrite(L7, 1);
  digitalWrite(L8, 0);
  digitalWrite(L9, 0);
  delay(500);
  digitalWrite(L0, 0);
  digitalWrite(L1, 0);
  digitalWrite(L2, 1);
  digitalWrite(L3, 1);
  digitalWrite(L4, 1);
  digitalWrite(L5, 1);
  digitalWrite(L6, 1);
  digitalWrite(L7, 1);
  digitalWrite(L8, 0);
  digitalWrite(L9, 0);
  delay(500);
  digitalWrite(L0, 1);
  digitalWrite(L1, 1);
  digitalWrite(L2, 1);
  digitalWrite(L3, 1);
  digitalWrite(L4, 1);
  digitalWrite(L5, 1);
  digitalWrite(L6, 0);
  digitalWrite(L7, 0);
  digitalWrite(L8, 0);
  digitalWrite(L9, 0);
  delay(500);
  digitalWrite(L0, 1);
  digitalWrite(L1, 1);
  digitalWrite(L2, 1);
  digitalWrite(L3, 1);
  digitalWrite(L4, 0);
  digitalWrite(L5, 0);
  digitalWrite(L6, 0);
  digitalWrite(L7, 0);
  digitalWrite(L8, 0);
  digitalWrite(L9, 0);
  delay(500);
  digitalWrite(L0, 1);
  digitalWrite(L1, 1);
  digitalWrite(L2, 0);
  digitalWrite(L3, 0);
  digitalWrite(L4, 0);
  digitalWrite(L5, 0);
  digitalWrite(L6, 0);
  digitalWrite(L7, 0);
  digitalWrite(L8, 0);
  digitalWrite(L9, 0);
  delay(500);
}