1
3
8
9
Combination
1-3-8-9 of Berend Jan van der Zwaag
|
1
|
Does it contain two non-4-touching dominoes? (Touching at the corners is allowed.) |
|
3
|
Does it fit together with two copies of another pentomino in a 3x5 rectangle? |
|
8
|
Does it fit together with a tromino and a tetromino in a 3x4 rectangle? |
|
9
|
Is its bounding rectangle a 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 |
|
3
|
N | Y | Y | N | N | Y | N | Y | N | Y | Y | Y |
|
8
|
N | N | Y | N | Y | Y | Y | Y | Y | N | Y | N |
|
9
|
Y | N | N | N | N | Y | N | Y | Y | Y | N | Y |
|
Solution 1 |
Solution 3 |
Solution 8  | Solution 9 |
