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Are you David Singmaster, author of the books below?
Notes on Rubik's 'Magic Cube' by David Singmaster Problems For Metagrobologists by David Singmaster Problems For Metagrobologists by David Singmaster Adventures In Recreational Mathematics - Volume I by David Singmaster Adventures In Recreational Mathematics - Volume II by David Singmaster Adventures In Recreational Mathematics (In 2 Volumes) by David Singmaster Adventures in Recreational Mathematics by David Singmaster Notes On Rubik's Cube by David Singmaster Notas sobre el cubo de Rubik by David Singmaster Rubik's magic Cube by David Singmaster


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