like: Priscilla has two (2) sisters, both of whom were teachers. → →
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Priscilla has two (2) sisters, both of whom were teachers. ☊ 
Priscilla có hai chị gái mà cả hai đều là giáo viên. ☊ Priscilla has two (2) sisters, both of whom were teachers. ☊ Priscilla có hai chị gái mà cả hai đều là giáo viên. ☊