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 (", ").

Let me give you an example: Paragraph- Sent 1: A Republican bid to keep the government open past Friday includes no new money for the construction of a border wall along the U.S.-Mexico border, according to several congressional aides familiar with ongoing talks.
Sent 2: GOP leaders submitted the new offer Tuesday afternoon in an effort to appease Democrats, whose votes are needed to avert a shutdown of federal agencies, several House and Senate aides said.
Sent 3: However, Republicans also insisted on increases in border security and defense spending, including money to repair existing fencing and new surveillance technology to patrol the nearly 2,000-mile border.
Sent 4: Democrats have indicated that they would support such appropriations so long as no money goes toward an actual wall.
Question: Who has to be appeased to keep the government open?.
The answer to this example can be: 1, 2.
Here is why: The question is: Who has to be appeased to keep the government open? The phrase "appease Democrats" is mentioned in Sent 2, about accepting offer that is mentioned in Sent 1 to "keep the government open". So, Sent 1 and Sent 2 are the sentences needed to answer this question.

OK. solve this:
Paragraph- Sent 1: They parted and Allan made his way pensively from Arthur's gate.
Sent 2: He walked the wheel-ruts, hands in his pockets and unshined shoes collecting dust.
Sent 3: Some quarter-mile from Arthur's gate, he halted, confronted by a halloo.
Sent 4: "Nathan?"Sent 5: he called out to the empty road.
Sent 6: The reply came from above him and Allan turned to see his friend reclining in the fork of a great tree.
Sent 7: "I had a hunch you'd be at Arthur's today," said Nathan, "so I thought I'd wait here for you."Sent 8: Nathan's lanky frame, dressed in a loose, tan jacket, fit into the branch like an elegant skeleton.
Sent 9: His hair fell loosely across a face that seemed always to have a knowing smirk hidden just beneath its surface, infusing his body with a rakish energy.
Sent 10: "So, Allan," said Nathan, unfolding and lowering his legs to the roadside, "how goes life for the quintessential American author?"Sent 11: "I wouldn't know," replied Allan dryly, before continuing in another tone entirely.
Sent 12: "I destroyed another story last night, Nathan."Sent 13: Leaning against his tree, Nathan shook his head.
Sent 14: "You mean, finished another story."Sent 15: "Yes, it is finished!
Sent 16: Ended!
Sent 17: Never again shall it see the rosy-fingered dawn!
Sent 18: Nathan, you've read these abominations of mine.
Sent 19: You know just as well as I that they have no future, no potential.
Sent 20: At best, they are faery tales; at worst, expeditions into macabre realms no healthy mind need ever see.". 
Question: Who does Allan encounter after he leaves Arthur's?.
Answer:
1, 6, 7.