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| Clause and Effect - Prolog Programming for the Working Programmer Recent countries visiting this post | |
| 22 | United States |
| 5 | United Kingdom |
| 4 | |
| 2 | Sweden |
| 1 | Poland |
| 1 | Thailand |
| 1 | Germany |
| 1 | China |
| 1 | Portugal |
| 1 | Hong Kong |
| 1 | Netherlands |