int tempo=10000,led[8]{4,6,9,11,20,26,35,37},strada=1;
void setup() {
  for(int i=2 ; i<46 ; i++){
    if(i==12) i=16;
    if(i==22) i=26;
    if(i==27) i=33;
    if(i==38) i=42;
    if(i==43) i=45;
    pinMode(i, OUTPUT);
  }
  for(int i=12 ; i<42 ; i++){
    if(i==16) i=38;
    pinMode(i, INPUT);
  }
}

void loop() {
  if(strada==1){
    digitalWrite(led[2]-2, HIGH);
    digitalWrite(led[3], HIGH);
    digitalWrite(led[4]-2, HIGH);
    digitalWrite(led[5], HIGH);

    for(int n=0;n<=1;n++){
      digitalWrite(led[0] - n, HIGH);
      digitalWrite(led[1] - 1, HIGH);
      digitalWrite(led[6] - n, HIGH);
      digitalWrite(led[7] - 1, HIGH);
      
      if (led[0] - n == 2){
        digitalWrite(led[1] - 1, LOW);
        digitalWrite(led[7] - 1, LOW);
        digitalWrite(led[1], HIGH);
        digitalWrite(led[7], HIGH);    
      } else{
        digitalWrite(led[1], LOW);
        digitalWrite(led[7], LOW);
      }

      if (led[0] - n == 3) delay(tempo/2);
      else delay(tempo);

      digitalWrite(led[0] - n, LOW);
      digitalWrite(led[6] - n, LOW);

    }
      digitalWrite(led[2]-2, LOW);
      digitalWrite(led[3], LOW);
      digitalWrite(led[4]-2, LOW);
      digitalWrite(led[5], LOW);
      strada=2;
  }
  if(strada==2){
    digitalWrite(led[0]-2, HIGH);
    digitalWrite(led[1], HIGH);
    digitalWrite(led[6]-2, HIGH);
    digitalWrite(led[7], HIGH);

    for(int n=0;n<=1;n++){
      digitalWrite(led[2] - n, HIGH);
      digitalWrite(led[3] - 1, HIGH);
      digitalWrite(led[4] - n, HIGH);
      digitalWrite(led[5] - 1, HIGH);
      
      if (led[0] - n == 2){
        digitalWrite(led[3] - 1, LOW);
        digitalWrite(led[5] - 1, LOW);
        digitalWrite(led[3], HIGH);
        digitalWrite(led[5], HIGH);    
      } else{
        digitalWrite(led[3], LOW);
        digitalWrite(led[5], LOW);
      }

      if (led[0] - n == 3) delay(tempo/2);
      else delay(tempo);

      digitalWrite(led[2] - n, LOW);
      digitalWrite(led[4] - n, LOW);

    }
      digitalWrite(led[0]-2, LOW);
      digitalWrite(led[1], LOW);
      digitalWrite(led[6]-2, LOW);
      digitalWrite(led[7], LOW);
      strada=1;
  }
}