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 (", ").

[EX Q]: Paragraph- Sent 1: From Babylon, Alexander went to Susa, one of the Achaemenid capitals, and captured its legendary treasury.
Sent 2: He sent the bulk of his army to the Persian ceremonial capital of Persepolis via the Royal Road.
Sent 3: Alexander himself took selected troops on the direct route to the city.
Sent 4: He had to storm the pass of the Persian Gates (in the modern Zagros Mountains) which had been blocked by a Persian army under Ariobarzanes and then hurried to Persepolis before its garrison could loot the treasury.
Sent 5: On entering Persepolis, Alexander allowed his troops to loot the city for several days.
Sent 6: Alexander stayed in Persepolis for five months.
Sent 7: During his stay a fire broke out in the eastern palace of Xerxes and spread to the rest of the city.
Sent 8: Possible causes include a drunken accident or deliberate revenge for the burning of the Acropolis of Athens during the Second Persian War.
Question: Which route did Alexander take to enter Persepolis?.
[EX A]: 2, 3, 4.

[EX Q]: Paragraph- Sent 1: LONDON, England (CNN) -- Last year's inaugural Prix Pictet photography award for environmental sustainability produced a stunning shortlist of photos.
Sent 2: Ed Kashi has documented the impact oil has made on the Niger Delta in Africa.
Sent 3: This year is no different with 12 photographers in the running for the first prize of 100,000 CHF ($97,500).
Sent 4: The theme in 2009 is described simply as "Earth."Sent 5: The aim is to highlight how man exploits the planet's resources and how this impacts the landscapes and communities surrounding them.
Sent 6: In an extraordinary series of photos Canadian Christopher Anderson captures how the quest for raw materials affects Venezuela.
Sent 7: In "The Diminishing Present," Portuguese-born Edgar Martins records forest landscapes in the moments before they are engulfed by flames.
Sent 8: In "Curse of the Black Gold: 50 Years of Oil in the Niger Delta," Ed Kashi captures the impact of the oil industry on Nigeria's environment and people since it was first discovered five decades ago.
Sent 9: Kashi, an American photojournalist, spent three years compiling his photos of the Niger Delta, making a total of five trips to the troubled region.
Sent 10: Kashi told CNN: "It was truly one of the most graphic examples of economic inequity that I have ever seen.
Sent 11: Especially with the backdrop of hundreds of billions of oil wealth that has been generated over the previous 50 years."Sent 12: As a result of his work, Kashi says that his photos are now being used by universities and NGOs to raise awareness to try and effect change.
Sent 13: To him, this has been one of the most gratifying and exciting by-products of his work.
Question: Why is Kashi so happy about the by-products of his work?.
[EX A]: 12, 13.

[EX Q]: Paragraph- Sent 1: As a husband, father and tenant of a Grand Rapids public housing complex, Aubrey Robertson puts security at the top of his home priority list.
Sent 2: Because of that, Robertson is all for a zero-tolerance drug law in force at Creston Plaza apartments on Grand Rapids' Northeast Side.
Sent 3: That includes cases in which families may be evicted for the drug use of a single family member, even off the premises.
Sent 4: Robertson sees it as a tool to keep his complex as clean and safe as possible.
Sent 5: "If there's one person (using drugs), that is a start," said Robertson, 52, a native of Jamaica.
Sent 6: He has lived the past four years at Creston Plaza with his wife, Tammy, and his daughter, Precious, 3.
Sent 7: In recent months, Robertson was pleased to see casual drug use at the complex diminish with the installation of security cameras.
Sent 8: "If there is a start, then there will be some other problem.
Sent 9: I totally agree (if there is a drug link), get them out."Sent 10: Critics say the law -- argued Tuesday before the U.S. Supreme Court -- tramples on individual rights and harms the very people public housing authorities are supposed to help.
Sent 11: "It's basically one strike and you're out, and I think they went beyond what Congress intended," said Michael Chielens, executive director of Western Michigan Legal Services.
Sent 12: "Someone who had no knowledge or involvement in a criminal act is being punished.
Sent 13: That's kind of a basic due process notion that we have had in our legal tradition for a long time."Sent 14: The case was brought by four Oakland, Calif., senior citizens, including 63-year-old great-grandmother Pearlie Rucker.
Sent 15: They received eviction notices because of the drug use of relatives or caregivers.
Sent 16: Rucker was ordered out because her mentally disabled daughter was caught with cocaine three blocks from the apartment she shared with her mother and other family members, court records show.
Sent 17: An appeals court blocked enforcement of the law.
Sent 18: At issue is whether housing directors are being more aggressive than Congress intended.
Question: Why does the tenant of the Creston Plaza complex think the law is a valid one?.
[EX A]:
1, 2, 4, 5, 6, 7, 8, 9.