Detailed Instructions: You are given a paragraph, with numbered sentences, and a question. Write the numbers of the sentences needed to answer the given question. Separate multiple sentence numbers with a comma (", "). E.g. "1, 2" would be the correct response if Sent 1 and Sent 2 are needed to answer the given question (do not include sentences that contain no information that is necessary to answer the question). Sort the sentence numbers in an increasing order (i.e., '1, 2', instead of '2, 1'). Your answer should not contain anything than the sentence numbers separated by a comma (e.g. '1, 2, 3, 4'). The given question requires more than one sentence to answer. So, your answer must contain at least one comma (", ").
Q: Paragraph- Sent 1: The Nara Period: Another of the new ideas was to set up a permanent residential capital for the imperial court, initially at Naniwa (present-day Osaka) and then a little to the east, at Nara, in 710.
Sent 2: Laid out like a chessboard (nearly half the size of China’s similarly designed capital, Chang’an), Nara had its imperial palace at the northern end, with court residences, Buddhist monasteries, and Shinto shrines stretching to the south.
Sent 3: In those peaceful years, without threat of foreign invasion or civil war, there were no city ramparts.
Sent 4: The era known as the Nara Period was marked by the religious fervor of the Buddhist monks and also by their accompanying artistic achievements.
Sent 5: The Japanese were attracted more to Buddhism’s ritual and art than to its complex philosophy, rendered all the more difficult because its texts were, for several centuries, available only in Chinese, the language of a small court elite.
Sent 6: Buddhist monks initiated great progress in Japanese architecture, bronze-casting, bridge-building, and sculpture.
Sent 7: To this day, historians of Chinese art find the best surviving examples of Tang-dynasty architecture among the seventh- and eighth-century temples in and around Nara.
Sent 8: By marrying his daughters to sons of the reigning emperor and then engineering timely abdications, a Fujiwara contrived always to be father-in-law, uncle, or grandfather behind the throne.
Sent 9: Very often the emperor was only a minor, so that the Fujiwara patriarch acted as regent.
Sent 10: He then persuaded the emperor to abdicate soon after his majority, and the regency would continue for the next youthful incumbent.
Sent 11: The important thing was to have the emperor’s sanction for the regent’s political decisions.
Sent 12: Very few emperors were reluctant to submit to Fujiwara domination.
Sent 13: The burden of his spiritual functions as high priest of Shinto and the tasks of administration led the emperor to welcome an early abdication, frequently to retire to a life of Buddhist meditation and scholarship.
Sent 14: The Fujiwara resented the Buddhist clergy’s great and growing influence in imperial affairs.
Sent 15: There were too many monasteries in and around Nara.
Sent 16: It was time to move the capital. 
Question: What facilitated the move of the capital?.
A:
14, 15, 16.