Assertion: peasant | /r/CapableOf | leave their masters
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Source sentences:
text: A temporary (Заповедные лета, or forbidden years) and later an open-ended prohibition for peasants to leave their masters was introduced by the ukase of 1597 under the reign of Boris Godunov, which took away the peasants' right to free movement around Yuri's Day, binding the vast majority of the Russian peasantry in full serfdom.