Tuhia he whiti kōrero poto i runga i te kaupapa e whai ake nei:  Ka whiwhi te tangata X i tētahi tohu Ph.D.
Ae ra, anei he rarangi poto: Ka whiwhi a Sommer i tana tohu Ph.D. i muri i nga tau o te whakapau kaha me te whakapau kaha. He nui tana whakaaro ki te whakatutukitanga, a he tino whakapehapeha ia ki a ia ano.