Input (grade 13): Ancient Persians cultivated Persian saffron (Crocus sativus' Hausknechtii ') in Derbena, Isfahan, and Khorasan by the 10th century BC.
Output (grade 11): Ancient Persians were growing their own type of saffron (Crocus sativus' Hausknechtii ') in Derbena, Isfahan, and Khorasan by the 10th century BC.