| 1 | In the latter years of his life he lived alone and never welcomed visitors. | |
| 2 | His job consists of helping old people who live alone. | |
| 3 | This means that the social chimpanzees are smarter than the solitary orangutan. | |
| 4 | Black widows are solitary year-round except during this violent mating ritual. | |
| 5 | Once you become a widow and live alone, people are strange toward you. |
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