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| The audience | Bill Craig | Bill Craig | Bill Craig | Bill Craig |
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| Bill Craig and Martin Davis | Bill Craig, Sol Feferman, and Michael Friedman | Bill Craig | Bill Craig with the conference organizers | Sol Feferman |
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| Branden Fitelson, Graciela De Pierris, and Michael Friedman | Michael Friedman | Dana Scott | Cesare Tinelli | Jouko Väänänen |
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| Johan van Benthem | Johan van Benthem |