| Non-trivial t-designs without repeated blocks exist for all t Recent countries visiting this post |  |
 | 5 | United States |
 | 3 | India |
 | 1 | |
 | 1 | Russian Federation |
| Non-trivial t-designs without repeated blocks exist for all t Recent countries visiting this post | |
| 5 | United States |
| 3 | India |
| 1 | |
| 1 | Russian Federation |