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| opera | |||
| Opera (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) | |||
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| one-pion exchange reggeized model; OPER model | |||
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| operatic | |||
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| operas | |||
| Oper: 8 phrases in 4 subjects |
| Art | 1 |
| Construction | 1 |
| General | 4 |
| High energy physics | 2 |