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// NotifyingList is our new go-to way to wrap a list
// with additional functions.
persistable sclass SSIList extends NotifyingList<SSI> is ByteIO {
  *() { init(); }
  *(Cl<SSI> l) { initAndAddAll(l); }
  
  public void readWrite(ByteHead head) {
    head.exchangeInt(-> size(), size -> addAll(repF(size, -> new SSI)));
    head.exchangeAll(this);
  }
  
  BufferedImage render(WidthAndHeight size) {
    ret renderAll(this, size);
  }
  
  BufferedImage renderOutlines(WidthAndHeight size) {
    ret render(size, g -> {
      g.setColor(Color.black);
      for (ssi : this) ssi.renderOutline(g);
    });
  }
}