abstract persistable sclass AbstractWAndH > Meta is WidthAndHeight {
  int w, h;
  
  public int getWidth() { ret w; }
  public int getHeight() { ret h; }
  
  *(int *w, int *h) {}
  
  S sizeToString() { ret n2(w) + "*" + n2(h) + " px"; }
}