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| Opéra m (One of the music genres that appears under Genre classification in Windows Media Player library. Based on ID3 standard tagging format for MP3 audio files. Winamp genre ID 103) | |||
| Inglés tesauro | |||
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| oil pollution environmental risk assessment | |||
| operational analysis | |||
| Open Process Engine For Reliable Activities | |||
| operational analysis | |||
| out-of-pile expulsion and reentry apparatus | |||
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| o | |||
| A powerful type of drama, where a majority of the words are solely sung. | |||
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Opera : 43 a las frases, 11 temas |
| Arte | 5 |
| Comunicaciones | 1 |
| Construcción | 1 |
| Estudios culturales | 5 |
| Finanzas | 1 |
| General | 19 |
| Industria | 4 |
| Ingeniería mecánica | 1 |
| Medicina | 3 |
| Pasatiempos y pasatiempos | 1 |
| Religión | 2 |