Lǎorén gūdāndān de zhù zài shān lǐ, méiyǒu rén péibàn.
The old man lived all alone in the mountains with no one for company.
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usage
孤单单 is the reduplicated intensified form of 孤单 (lonely/alone). The doubled 单 intensifies the feeling of isolation and loneliness. Compare: 孤独 (loneliness, more literary).