user: 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 (", ").
See one example below:
Problem: 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?.
Solution: 1, 2.
Explanation: 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.

Problem: Paragraph- Sent 1: In 1917, Einstein applied the general theory of relativity to model the structure of the universe as a whole.
Sent 2: He apprehended that his equations predicted the universe to be either contracting or expanding.
Sent 3: He wanted the universe to be eternal and unchanging, but this type of universe is not consistent with relativity.
Sent 4: To fix this, Einstein modified the general theory by introducing a new notion, the cosmological constant, which he called ''Lambda''.
Sent 5: The purpose of Lambda was to rectify the effects of gravity and allow the whole system to stay balanced.
Sent 6: With a positive cosmological constant, the universe could be an eternal static sphere.
Sent 7: However, in 1929, Edwin Hubble confirmed that the universe is expanding, Einstein exclaimed after his Mount Wilson visit with Hubble: "If there is no quasi-static world, then away with the cosmological term!"Sent 8: and Einstein supposedly discarded the cosmological constant.
Sent 9: Einstein believed a spherical static universe is philosophically preferred, because it would obey Mach's principle.
Sent 10: He had shown that general relativity incorporates Mach's principle to a certain extent in frame dragging by gravitomagnetic fields, but he knew that Mach's idea would not work if space goes on forever.
Sent 11: In a closed universe, he believed that Mach's principle would hold.
Sent 12: Mach's principle has generated much controversy over the years.
Sent 13: In many of Einstein biographies, writers claim that he called the creation of Lambda his "biggest blunder".
Sent 14: Recently, astrophysicist Mario Livio showed that Einstein possibly never said that.
Sent 15: Instead of discarding Lambda, Einstein was continually experimenting with it.
Sent 16: In late 2013, Irish physicist Cormac O'Raifeartaigh, happened to discover a handwritten manuscript by Einstein which was since then overlooked by other scientists.
Sent 17: The research paper was titled ''"Zum kosmologischen Problem"'' ("About the Cosmological Problem").
Sent 18: And Einstein proposed a revision of his model, still with a cosmological constant, but now the constant was responsible for the creation of new matter as the universe expanded. 
Question: What did Einstein use as his "cosmological constant" and what was its purpose?.
Solution:

assistant: 4, 5.