[The Doctor and Tryst are discussing the CET machine]
And you invented this marvelous machine to collect your specimens? You know, I knew a man once who toyed with an idea like this. What was his name, a Professor... Professor Stein?
Professor Stein!
Yes.
[delighted] Oh! A dear friend! He was my mentor! We worked on this idea together before he died, of course. Then we stopped.
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