void setup() {
  pinMode(23, OUTPUT);
  pinMode(22, OUTPUT);
  pinMode(21, OUTPUT);
  pinMode(19, OUTPUT);
  pinMode(18, OUTPUT);
  pinMode(17, OUTPUT);
}
void show(int a, int b, int c, int d, int e, int f) {
  digitalWrite(23, a);
  digitalWrite(22, b);
  digitalWrite(21, c);
  digitalWrite(19, d);
  digitalWrite(18, e);
  digitalWrite(17, f);
}
void loop() {
  show(HIGH, LOW, LOW, LOW, LOW, LOW);
  delay(1000);
  show(LOW, HIGH, LOW, LOW, LOW, LOW);
  delay(1000);
  show(LOW, LOW, HIGH, LOW, LOW, LOW);
  delay(1000);
  show(LOW, LOW, LOW, HIGH, LOW, LOW);
  delay(1000);
  show(LOW, LOW, LOW, LOW, HIGH, LOW);
  delay(1000);
  show(LOW, LOW, LOW, LOW, LOW, HIGH);
  delay(1000);
  show(LOW, LOW, LOW, LOW, LOW, HIGH);
  delay(1000);
  show(LOW, LOW, LOW, LOW, HIGH, LOW);
  delay(1000);
  show(LOW, LOW, LOW, HIGH, LOW, LOW);
  delay(1000);
  show(LOW, LOW, HIGH, LOW, LOW, LOW);
  delay(1000);
  show(LOW, HIGH, LOW, LOW, LOW, LOW);
  delay(1000);
  show(HIGH, LOW, LOW, LOW, LOW, LOW);
  delay(1000);
}