Relationship rel = mpp.getRelationshipsPart().getRelationshipByID("rId2");
mpp.removeSlide(rel);
System.out.println("\n\n saving .. \n\n");
String outputfilepath = "data/pptx4j/RemovedSlide-Pptx4j.pptx";
presentationMLPackage.save(new java.io.File(outputfilepath));
System.out.println("\n\n done .. \n\n");
}
}