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| classe A de um andar amplificador; classe AB de um andar amplificador | |||
| classe A: 19 phrases in 12 subjects |
| Brazil | 1 |
| Communications | 3 |
| Electronics | 3 |
| Finances | 2 |
| General | 2 |
| Information technology | 1 |
| Life sciences | 1 |
| Materials science | 1 |
| Medical | 1 |
| Natural resourses and wildlife conservation | 1 |
| Patents | 2 |
| Transport | 1 |