In 2013 he proposed to me the same problem for four pentominoes. This problem is even harder! Here are the smallest known solutions. If you find a smaller solution or solve an unsolved case, please write.
If a cell is shaded, one or more of the corresponding triples is unsolved.
5F-5I-5L-5N | 5F-5I-5L-5P | 5F-5I-5L-5T | 5F-5I-5L-5U | 5F-5I-5L-5V | ||
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5F-5I-5L-5W | 5F-5I-5L-5Y | 5F-5I-5L-5Z | 5F-5I-5N-5P | 5F-5I-5N-5T | 5F-5I-5N-5U | |
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5F-5I-5N-5V | 5F-5I-5N-5W | 5F-5I-5N-5Y | 5F-5I-5N-5Z | |||
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5F-5I-5P-5T | 5F-5I-5P-5U | 5F-5I-5P-5V | 5F-5I-5P-5W | 5F-5I-5P-5Y | ||
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5F-5I-5P-5Z | 5F-5I-5T-5U | 5F-5I-5T-5V | 5F-5I-5T-5W | 5F-5I-5T-5Y | ||
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5F-5I-5T-5Z | 5F-5I-5U-5V | 5F-5I-5U-5W | 5F-5I-5U-5Y | 5F-5I-5U-5Z | 5F-5I-5V-5W | |
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5F-5I-5V-5Y | 5F-5I-5V-5Z | 5F-5I-5W-5Y | 5F-5I-5W-5Z | |||
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5F-5I-5Y-5Z | 5F-5L-5N-5P | 5F-5L-5N-5T | 5F-5L-5N-5U | 5F-5L-5N-5V | ||
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5F-5L-5N-5W | 5F-5L-5N-5X | 5F-5L-5N-5Y | 5F-5L-5N-5Z | 5F-5L-5P-5T | 5F-5L-5P-5U | |
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5F-5L-5P-5V | 5F-5L-5P-5W | 5F-5L-5P-5X | 5F-5L-5P-5Y | 5F-5L-5P-5Z | ||
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5F-5L-5T-5U | 5F-5L-5T-5V | 5F-5L-5T-5W | 5F-5L-5T-5X | 5F-5L-5T-5Y | ||
![]() | ![]() Livio Zucca | ![]() | ||||
5F-5L-5T-5Z | 5F-5L-5U-5V | 5F-5L-5U-5W | 5F-5L-5U-5Y | 5F-5L-5U-5Z | 5F-5L-5V-5W | |
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5F-5L-5V-5Y | 5F-5L-5V-5Z | 5F-5L-5W-5Y | 5F-5L-5W-5Z | 5F-5L-5X-5Y | ||
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5F-5L-5Y-5Z | 5F-5N-5P-5T | 5F-5N-5P-5U | 5F-5N-5P-5V | 5F-5N-5P-5W | 5F-5N-5P-5X | |
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5F-5N-5P-5Y | 5F-5N-5P-5Z | 5F-5N-5T-5U | 5F-5N-5T-5V | 5F-5N-5T-5W | 5F-5N-5T-5X | |
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5F-5N-5T-5Y | 5F-5N-5T-5Z | 5F-5N-5U-5V | 5F-5N-5U-5W | 5F-5N-5U-5Y | ||
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5F-5N-5U-5Z | 5F-5N-5V-5W | 5F-5N-5V-5Y | 5F-5N-5V-5Z | |||
![]() | ![]() Livio Zucca | ![]() | ||||
5F-5N-5W-5Y | 5F-5N-5W-5Z | 5F-5N-5X-5Y | 5F-5N-5Y-5Z | |||
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5F-5P-5T-5U | 5F-5P-5T-5V | 5F-5P-5T-5W | 5F-5P-5T-5X | 5F-5P-5T-5Y | ||
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5F-5P-5T-5Z | 5F-5P-5U-5V | 5F-5P-5U-5W | 5F-5P-5U-5Y | 5F-5P-5U-5Z | 5F-5P-5V-5W | |
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5F-5P-5V-5Y | 5F-5P-5V-5Z | 5F-5P-5W-5Y | 5F-5P-5W-5Z | 5F-5P-5X-5Y | 5F-5P-5Y-5Z | |
![]() Livio Zucca | ![]() | ![]() | ![]() | ![]() | ||
5F-5T-5U-5V | 5F-5T-5U-5W | 5F-5T-5U-5Y | 5F-5T-5U-5Z | 5F-5T-5V-5W | 5F-5T-5V-5Y | |
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5F-5T-5V-5Z | 5F-5T-5W-5Y | 5F-5T-5W-5Z | 5F-5T-5X-5Y | 5F-5T-5Y-5Z | 5F-5U-5V-5W | |
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5F-5U-5V-5Y | 5F-5U-5V-5Z | 5F-5U-5W-5Y | 5F-5U-5W-5Z | 5F-5U-5Y-5Z | 5F-5V-5W-5Y | |
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5F-5V-5W-5Z | 5F-5V-5Y-5Z | 5F-5W-5Y-5Z | 5I-5L-5N-5P | 5I-5L-5N-5T | ||
![]() | ![]() Gabriele Carelli | |||||
5I-5L-5N-5U | 5I-5L-5N-5V | 5I-5L-5N-5W | 5I-5L-5N-5Y | |||
![]() Livio Zucca | ![]() | ![]() | ||||
5I-5L-5N-5Z | 5I-5L-5P-5T | 5I-5L-5P-5U | 5I-5L-5P-5V | |||
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5I-5L-5P-5W | 5I-5L-5P-5Y | 5I-5L-5P-5Z | 5I-5L-5T-5U | 5I-5L-5T-5V | ||
![]() | ![]() Livio Zucca | |||||
5I-5L-5T-5W | 5I-5L-5T-5Y | 5I-5L-5T-5Z | 5I-5L-5U-5V | 5I-5L-5U-5W | 5I-5L-5U-5Y | |
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5I-5L-5U-5Z | 5I-5L-5V-5W | 5I-5L-5V-5Y | 5I-5L-5V-5Z | 5I-5L-5W-5Y | ||
![]() | ![]() Livio Zucca | ![]() | ||||
5I-5L-5W-5Z | 5I-5L-5Y-5Z | 5I-5N-5P-5T | 5I-5N-5P-5U | 5I-5N-5P-5V | ||
![]() | ![]() Livio Zucca | |||||
5I-5N-5P-5W | 5I-5N-5P-5Y | 5I-5N-5P-5Z | 5I-5N-5T-5U | 5I-5N-5T-5V | ||
![]() | ![]() | ![]() Livio Zucca | ||||
5I-5N-5T-5W | 5I-5N-5T-5Y | 5I-5N-5T-5Z | 5I-5N-5U-5V | 5I-5N-5U-5W | 5I-5N-5U-5Y | |
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5I-5N-5U-5Z | 5I-5N-5V-5W | 5I-5N-5V-5Y | 5I-5N-5V-5Z | |||
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5I-5N-5W-5Y | 5I-5N-5W-5Z | 5I-5N-5Y-5Z | 5I-5P-5T-5U | 5I-5P-5T-5V | ||
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5I-5P-5T-5W | 5I-5P-5T-5Y | 5I-5P-5T-5Z | 5I-5P-5U-5V | 5I-5P-5U-5W | ||
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5I-5P-5U-5Y | 5I-5P-5U-5Z | 5I-5P-5V-5W | 5I-5P-5V-5Y | 5I-5P-5V-5Z | ||
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5I-5P-5W-5Y | 5I-5P-5W-5Z | 5I-5P-5Y-5Z | 5I-5T-5U-5V | 5I-5T-5U-5W | ||
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5I-5T-5U-5Y | 5I-5T-5U-5Z | 5I-5T-5V-5W | 5I-5T-5V-5Y | 5I-5T-5V-5Z | 5I-5T-5W-5Y | |
5I-5T-5W-5Z | 5I-5T-5Y-5Z | 5I-5U-5V-5W | 5I-5U-5V-5Y | 5I-5U-5V-5Z | 5I-5U-5W-5Y | |
5I-5U-5W-5Z | 5I-5U-5Y-5Z | 5I-5V-5W-5Y | 5I-5V-5W-5Z | 5I-5V-5Y-5Z | ||
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5I-5W-5Y-5Z | 5L-5N-5P-5T | 5L-5N-5P-5U | 5L-5N-5P-5V | 5L-5N-5P-5W | 5L-5N-5P-5X | |
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5L-5N-5P-5Y | 5L-5N-5P-5Z | 5L-5N-5T-5U | 5L-5N-5T-5V | 5L-5N-5T-5W | ||
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5L-5N-5T-5X | 5L-5N-5T-5Y | 5L-5N-5T-5Z | 5L-5N-5U-5V | |||
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5L-5N-5U-5W | 5L-5N-5U-5Y | 5L-5N-5U-5Z | 5L-5N-5V-5W | |||
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5L-5N-5V-5Y | 5L-5N-5V-5Z | 5L-5N-5W-5Y | 5L-5N-5W-5Z | 5L-5N-5X-5Y | ||
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5L-5N-5Y-5Z | 5L-5P-5T-5U | 5L-5P-5T-5V | 5L-5P-5T-5W | |||
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5L-5P-5T-5X | 5L-5P-5T-5Y | 5L-5P-5T-5Z | 5L-5P-5U-5V | |||
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5L-5P-5U-5W | 5L-5P-5U-5Y | 5L-5P-5U-5Z | 5L-5P-5V-5W | 5L-5P-5V-5Y | ||
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5L-5P-5V-5Z | 5L-5P-5W-5Y | 5L-5P-5W-5Z | 5L-5P-5X-5Y | |||
![]() Livio Zucca | ![]() | ![]() | ![]() | |||
5L-5P-5Y-5Z | 5L-5T-5U-5V | 5L-5T-5U-5W | 5L-5T-5U-5Y | 5L-5T-5U-5Z | 5L-5T-5V-5W | |
![]() | ![]() Gabriele Carelli | ![]() Gabriele Carelli | ![]() | |||
5L-5T-5V-5Y | 5L-5T-5V-5Z | 5L-5T-5W-5Y | 5L-5T-5W-5Z | 5L-5T-5X-5Y | 5L-5T-5Y-5Z | |
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5L-5U-5V-5W | 5L-5U-5V-5Y | 5L-5U-5V-5Z | 5L-5U-5W-5Y | |||
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5L-5U-5W-5Z | 5L-5U-5Y-5Z | 5L-5V-5W-5Y | 5L-5V-5W-5Z | 5L-5V-5Y-5Z | ||
![]() Gabriele Carelli | ![]() | |||||
5L-5W-5Y-5Z | 5N-5P-5T-5U | 5N-5P-5T-5V | 5N-5P-5T-5W | 5N-5P-5T-5X | ||
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5N-5P-5T-5Y | 5N-5P-5T-5Z | 5N-5P-5U-5V | 5N-5P-5U-5W | |||
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5N-5P-5U-5Y | 5N-5P-5U-5Z | 5N-5P-5V-5W | 5N-5P-5V-5Y | |||
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5N-5P-5V-5Z | 5N-5P-5W-5Y | 5N-5P-5W-5Z | 5N-5P-5X-5Y | |||
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5N-5P-5Y-5Z | 5N-5T-5U-5V | 5N-5T-5U-5W | 5N-5T-5U-5Y | 5N-5T-5U-5Z | 5N-5T-5V-5W | |
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5N-5T-5V-5Y | 5N-5T-5V-5Z | 5N-5T-5W-5Y | 5N-5T-5W-5Z | 5N-5T-5X-5Y | ||
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5N-5T-5Y-5Z | 5N-5U-5V-5W | 5N-5U-5V-5Y | 5N-5U-5V-5Z | 5N-5U-5W-5Y | ||
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5N-5U-5W-5Z | 5N-5U-5Y-5Z | 5N-5V-5W-5Y | 5N-5V-5W-5Z | 5N-5V-5Y-5Z | ||
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5N-5W-5Y-5Z | 5P-5T-5U-5V | 5P-5T-5U-5W | 5P-5T-5U-5Y | 5P-5T-5U-5Z | ||
![]() Livio Zucca | ||||||
5P-5T-5V-5W | 5P-5T-5V-5Y | 5P-5T-5V-5Z | 5P-5T-5W-5Y | 5P-5T-5W-5Z | ||
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5P-5T-5X-5Y | 5P-5T-5Y-5Z | 5P-5U-5V-5W | 5P-5U-5V-5Y | |||
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5P-5U-5V-5Z | 5P-5U-5W-5Y | 5P-5U-5W-5Z | 5P-5U-5Y-5Z | 5P-5V-5W-5Y | ||
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5P-5V-5W-5Z | 5P-5V-5Y-5Z | 5P-5W-5Y-5Z | 5T-5U-5V-5W | 5T-5U-5V-5Y | ||
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5T-5U-5V-5Z | 5T-5U-5W-5Y | 5T-5U-5W-5Z | 5T-5U-5Y-5Z | 5T-5V-5W-5Y | 5T-5V-5W-5Z | |
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5T-5V-5Y-5Z | 5T-5W-5Y-5Z | 5U-5V-5W-5Y | 5U-5V-5W-5Z | 5U-5V-5Y-5Z | ||
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5U-5W-5Y-5Z | 5V-5W-5Y-5Z | |||||
Last revised 2014-11-11.