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| person- years: 17 phrases in 10 subjects |
| Demography | 1 |
| Economy | 1 |
| General | 1 |
| Health care | 1 |
| Labor law | 2 |
| Patents | 1 |
| Social science | 3 |
| Statistics | 1 |
| Transport | 1 |
| United Nations | 5 |
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