| 41. | Another treaty in 1974 set a size limit on underground detonations.
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| 42. | Crime underground _ in the subways _ is on the rise.
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| 43. | In 1990, about 19, 000 felonies were committed underground.
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| 44. | They lurk underground like alien predators in a science fiction film.
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| 45. | He was a part of the Hungarian anti-Nazi underground.
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| 46. | We're seeing increasing more and more material going underground.
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| 47. | If roots are not underground, they are vulnerable, though.
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| 48. | The rest are tolerated by law enforcement authorities or operate underground.
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| 49. | Popularity may disqualify a band forever from the hipster collector underground.
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| 50. | His lyrics continued to examine adult subjects and the urban underground.
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