1
2
3
9
Combination
1-2-3-9 of Berend Jan van der Zwaag
|
1
|
Does it contain two non-4-touching dominoes? (Touching at the corners is allowed.) |
|
2
|
Does it fit together with a heptomino in a 3x4 rectangle? |
|
3
|
Does it fit together with two copies of another pentomino in a 3x5 rectangle? |
|
9
|
Does it fit inside a 3x3 square? |
| F | I | L | N | P | T | U | V | W | X | Y | Z | |
|
1
|
N | Y | Y | Y | N | N | Y | Y | Y | N | N | Y |
|
2
|
N | N | Y | N | Y | Y | Y | Y | N | N | Y | N |
|
3
|
N | Y | Y | N | N | Y | N | Y | N | Y | Y | Y |
|
9
|
Y | N | N | N | N | Y | N | Y | Y | Y | N | Y |
|
Solution 1 |
Solution 2 |
Solution 3  |
Solution 9
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