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- Rainbows1
- Rifāʻīyah1
- Roosters1
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- Rüstem Paşa Camii (Istanbul, Turkey)1
- Sajʻ1
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- Satellites--Phases1
- Sexagesimal system1
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- Sharḥ al-Mawāqif (Jurjānī, ʻAlī ibn Muḥammad, al-Sayyid al-Sharīf)1
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