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  Ballad
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| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Music.kif 591-592 | |
| No TPTP formula. May not be expressible in strict first order. | Music.kif 590-590 | Ballad 是 MusicGenre 的 instance |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | Music.kif 593-593 |
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