| A Classification of Partial Boolean Clones Recent countries visiting this post |  |
 | 8 | United States |
 | 3 | Russian Federation |
 | 1 | Germany |
 | 1 | Japan |
| A Classification of Partial Boolean Clones Recent countries visiting this post | |
| 8 | United States |
| 3 | Russian Federation |
| 1 | Germany |
| 1 | Japan |