| 1 | Black clouds are an unmistakable sign of coming rain. | |
| 2 | It is said to be an omen of misfortune. | |
| 3 | Los Angeles is a premonition of this new civilization. | |
| 4 | Of course, this becomes a self-fulfilling prophecy. | |
| 5 | Phytoplankton can also be the harbingers of death or disease. |
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