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Please cite/link your sources, if possible. At some point at least twenty-four hours from now, I will:
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Based on the Raavad's figures, the era of the Rabbanan Savorai lasted 189 years, from 4260 to 4449. Though he then summarizes it as 187 years.
There are 189 words in the Aseret Hadibrot on the second luchot (Parsh Va'etchanan)