Printing page twice without dialog box modify script ?

Hi,
 
I know that this script will print 2 pages once via the dialog box and if I change
bUI: to false the dialog box wont show and it will print the pages once.
 
this.print({
bUI: true,
bSilent: true,
bShrinkToFit: true,
nStart: 0,
nEnd: 1,
});
 
How do I get it to print 2 copies of the same 2 pages.
 
No fancy 2 pages to one page, just 2 copies of the same 2 pages ??
 
In other words send it to the printer once without sending twice.