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 Golden Heian Era: The geomancers in 794 decided that Heian-kyo (modern Kyoto) would be an auspicious site for the imperial family.
Sent 2: It was indeed — until 1869.
Sent 3: Grants of tax-free land over the years had been made to Buddhist temples and members of the court aristocracy.
Sent 4: The most powerful families thus carved out for themselves whole regions that were to become the fiefdoms of Japanese feudalism.
Sent 5: By the end of the eighth century the clans had created a hierarchy of shiki, or rights, from the highest to the lowest ranks of society.
Sent 6: The aristocrat or court patron lent his prestige to a powerful provincial proprietor, who employed a competent estate-manager to oversee smallholders, who in turn worked their farms with dependent laborers.
Sent 7: This elaborate structure of interdependent rights and obligations was to serve Japanese society right into the 20th century.
Sent 8: Meanwhile, Heian court life blossomed in an effusion of aesthetic expression.
Sent 9: Princes and princesses judged the merits of birds, insects, flowers, roots, or seashells.
Sent 10: Literary party games held in ornate palace gardens required each guest to compose a small poem as his wine cup floated toward him along a miniature winding channel of water.
Sent 11: Expeditions were organized to the best viewing points for the first spring cherry blossoms, and special pavilions were built to watch the rising of the full moon.
Sent 12: Every gesture, from the most banal opening of an umbrella to the sublimest act of lovemaking, had its appropriate ceremonial.
Sent 13: Conversation often took the form of elegant exchanges of improvised verse.
Sent 14: The changing role of Chinese culture in Japanese life was epitomized in the language itself.
Sent 15: In the absence of an indigenous alphabet, Japanese scholars had with the greatest difficulty tried to adapt the complex ideograms of monosyllabic Chinese to the essentially polysyllabic Japanese.
Sent 16: Thus developed the katakana system used as a vehicle for writing Buddhist names and concepts.
Sent 17: After rival Fujiwara factions had been struggling for years to gain control of the imperial throne, they turned to the Taira and Minamoto armies in 1156 to wage the four-year war that heralded the end of the golden age of the Heian court.
Sent 18: The Taira, controlling the region along the Inland Sea, defeated the Minamoto armies based in the Kanto province east of the capital. 
Question: Why were the most powerful families able to obtain whole regions for themselves?.

A: 3, 4.
****
Q: Paragraph- Sent 1: The troops, hearing the reports of the gun, came rushing out to see what was the matter.
Sent 2: They found that the mule had passed in his chips, and when they learned the cause they all agreed that I had served him just right.
Sent 3: Taking the saddle and bridle from the dead body, I proceeded into the post and delivered the dispatches to Captain Parker.
Sent 4: I then went over to Dick Curtis' house, which was headquarters for the scouts, and there put in several hours of solid sleep.
Sent 5: During the day General Hazen returned from Fort Harker, and he also had some important dispatches to send to General Sheridan.
Sent 6: I was feeling quite elated over my big ride; and seeing that I was getting the best of the other scouts in regard to making a record, I volunteered to carry General Hazen's dispatches to Fort Hays.
Sent 7: The General accepted my services, although he thought it was unnecessary for me to kill myself.
Sent 8: I told him that I had business at Fort Hays, and wished to go there anyway, and it would make no difference to the other scouts, for none of them appeared willing to undertake the trip. 
Question: Why did the general had to accept my services ?.

A: 7, 8.
****
Q: Paragraph- Sent 1: Flowing water causes sediment to move.
Sent 2: Flowing water can erode both rocks and soil.
Sent 3: You have already learned that materials can dissolve in water.
Sent 4: With enough time, even rocks can be dissolved by water.
Sent 5: This process happens really slowly.
Sent 6: It may take over a million years to dissolve a rock.
Sent 7: It doesnt matter how big the rock is.
Sent 8: With enough time, flowing water can dissolve it.
Sent 9: Moving water also has the ability to move small pieces of rock and soil.
Sent 10: How can water move a rock?
Sent 11: Doesnt it need energy?
Sent 12: Of course, water gets its energy because it is moving.
Sent 13: Moving water has kinetic energy.
Sent 14: Things that have more energy can do more work.
Sent 15: When water stops moving it will have no energy.
Sent 16: It will no longer be able to move the rock and soil.
Sent 17: When this happens the rock and soil will settle to the bottom of the calm water.
Sent 18: Scientists call this process deposition. 
Question: What is it called when rock and soil settle to the bottom of calm water?.

A:
17.
****
