void Barrangements(int k1, int k2){
  //background arrangements of k1, except for k2
  //
  //Parents
  String[] pdata=split(parents[k1],' '); pmax=pdata.length; 
  for (j=0;j<pdata.length-1;j++){
    par[j/5][j%5]=int(pdata[j])-1;
    if (int(pdata[j])-1!=k2){
      String[] data=split(configs[int(pdata[j])-1],' ');
      for (k=0; k<=11;k++){H[k]   =boolean(int(data[k]));}
      for (k=12;k<=23;k++){V[k-12]=boolean(int(data[k]));}
      Y=floor(j/5); X=j-5*Y;
      boxdraw(X*50+25,Y*50+25,c,r,H,V);
    }
  }
  //
  //Children
  String[] cdata=split(children[k1],' '); cmax=cdata.length;
  for (j=0;j<cdata.length-1;j++){
    chi[j/5][j%5]=int(cdata[j])-1;
    if (int(cdata[j])-1!=k2){
      String[] data=split(configs[int(cdata[j])-1],' ');
      for (k=0; k<=11;k++){H[k]   =boolean(int(data[k]));}
      for (k=12;k<=23;k++){V[k-12]=boolean(int(data[k]));}
      Y=floor(j/5); X=j-5*Y;
      boxdraw(X*50+25,Y*50+275,c,r,H,V);
    }
  }
}

float[] location(int k1, int k2){
  //return the x and y coordinates of the center of the small
  //box containing k2 among all the relatives of k1.
  float[] out={0,0};
  //
  //Parents
  String[] pdata=split(parents[k1],' '); 
  for (j=0;j<pdata.length-1;j++){
    if (int(pdata[j])-1==k2){
      Y=floor(j/5);   X=j-5*Y; 
      out[0]=X*50+25; out[1]=Y*50+25;
    }
  }
  //
  //Children
  String[] cdata=split(children[k1],' '); 
  for (j=0;j<cdata.length-1;j++){
    if (int(cdata[j])-1==k2){
      Y=floor(j/5);   X=j-5*Y; 
      out[0]=X*50+25; out[1]=Y*50+275;
    }
  }
  return out;
}