Input (grade 13): Ricklefs (1991), pages 12 - 14 Other Indonesian areas gradually adopted Islam, making it the dominant religion in Java and Sumatra by the end of the 16th century.
Output (grade 9): Ricklefs (1991), pages 3 to 14 More and more Indonesian areas gradually adopted Islam. By the end of the 16th century it was the dominant religion in Java and Sumatra.