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4020 Volume 16 1952 4021 Volume 16 21-Aug-52
Summary: Interaction between adaptations.
Summary: My solution includes all solutions.
Personal notes [16]: The 'Ashby' solution includes all solutions, 4021.
This image is reproduced courtesy of The Estate of W. Ross Ashby. Copyright 1972, 2008 © The Estate of W. Ross Ashby
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