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https://interferentia.blog/2015/06/21/rub%ca%bf-al-khali-%d8%a7%d9%84%d8%b1%d8%a8%d8%b9-%d8%a7%d9%84%d8%ae%d8%a7%d9%84%d9%8a-ossia-il-quarto-vuoto/
Rubʿ al-Khālī (الربع الخالي), ossia "Il quarto vuoto"