class sBox
{
  int iPos;
  int jPos;
  int num;
  
  boolean[] numPossible;
  
  sBox(int i, int j)
  {
    iPos = i;
    jPos = j;
    
    num = -1;
    
    numPossible = new boolean[9];
    
    for(int x=0;x<numPossible.length;x++)
      numPossible[x] = true;
  }
  
  void display()
  {
    fill(0);
    
    if(num == -1)
    {
    for(int i=0;i<9;i++)
      if (numPossible[i])
        text(i+1,40*jPos+28+(i%3)*11,40*iPos+34+int(i/3)*10);
    }
    else
    {
      textSize(30);
      text(num,40*jPos+33,40*iPos+52); 
      textSize(11);
    }
    
  }
  
  void ruleOut(int x)
  {
    numPossible[x-1] = false;
  }
  
}