Embedding the optimal all-to-all personalized exchange on multistage interconnection networks<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si84.gif" display="inline" overflow="scroll"><mml:msup><mml:mrow /><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math>