unsigned long last_time = 0;
unsigned long lt2 = 0;
unsigned long ltl = 0;
int t = 0;
int s = 0;
int wait = 0;

void setup()
{
  pinMode(2, OUTPUT);
  pinMode(25, OUTPUT);
}
void v(int x, int c,int y) 
{
  if (wait == 0) 
  {
    if ((s % 2 == 0)) 
    {
      digitalWrite(25, HIGH);
    } 
    else 
    {
      digitalWrite(25, LOW);
    }
    s++;
    if (s >= x*2) 
    {
      wait = 1;
      s=0;
    }
  } 
  else 
  {
    wait++;
    if (wait > y) 
    {
      wait = 0;
      if (c == 1)t = 0; 
      else 
      {
        t = 1;
      }
    }
  }
}
void loop()
{
  //s1
  if (millis() - ltl >= 500) 
  {
    digitalWrite(2, !digitalRead(2));
    ltl = millis();
  }
  if (t == 0) 
  {
    if (millis() - last_time >= 1000) 
    {
      digitalWrite(2, digitalRead(2));
      last_time = millis();
      lt2=last_time;
      v(3, 0,2);
    }
  } 
  else 
  { //s2
    if (millis() - lt2 >= 500) 
    {
      lt2 = millis();
      v(6, 1,4);
    }
  }
}