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Wally Koval
Thomas Pavitte
Anonymous
Tom Howey
Summersdale Publishers
Gary Wigglesworth
Ellie Dix
Mark Wilson
Donald Lemke
Various
Dieter Gebhardt, Geert Hellings, Wei - Hwa, David Singmaster, Jerry Slocum
Laurence King Publishing, Saskia Gwinn
Zachary Woodard
Ivan Moscovich
Anon
Robb Pearlman
Ivan Brett
Emma Aguado
Adam Simpson
Noble Smith
Abbie Salny, Mensa Mensa
Graham Burgess
Gemma Correll
Royal Observatory Greenwich, Gareth Moore
Gareth Moore
David Gauntlett, Valeria Duarte Reyes
Michelle Morgan
Mark Huckvale
Adrienne Raphel
Quiz Book
Kate Freeman
Anja Brunt
Alan Stillson
Lisa den Teuling
Debora Robertson
James Pitts
Mac King, Bill King
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