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 (", ").

Example Input: Paragraph- Sent 1: Electric current cannot go through empty space.
Sent 2: Electricity needs something to flow through.
Sent 3: Electricity cannot flow through all materials.
Sent 4: Some materials resist the flow of electricity.
Sent 5: Some materials let electricity pass through easily.
Sent 6: Scientists classify these into two groups.
Sent 7: These groups are called conductors and insulators.
Sent 8: Materials that allow electrons to flow freely are called electric conductors.
Sent 9: Electricity is able to race through these materials.
Sent 10: Copper, aluminum, and steel are good conductors.
Sent 11: Materials that resist the flow of electricity are called electric insulators.
Sent 12: Instead of racing, the current may travel in slow motion, if at all.
Sent 13: Wood, rubber, and plastic are examples of electric insulators.
Sent 14: You probably know that electric wires are made of metal.
Sent 15: They typically have a rubber or plastic coating.
Sent 16: Do you know why?
Sent 17: Metals are good electric conductors.
Sent 18: They offer little resistance to electricity.
Question: Do metals offer much resistance to electricity?.
Example Output: 17.

Example Input: Paragraph- Sent 1: We were cornered in a sort of way already.
Sent 2: But these butchers up the cavern had been surprised, they were probably scared, and they had no special weapons, only those little hatchets of theirs.
Sent 3: And that way lay escape.
Sent 4: Their sturdy little forms--ever so much shorter and thicker than the mooncalf herds--were scattered up the slope in a way that was eloquent of indecision.
Sent 5: I had the moral advantage of a mad bull in a street.
Sent 6: But for all that, there seemed a tremendous crowd of them.
Sent 7: Very probably there was.
Sent 8: Those Selenites down the cleft had certainly some infernally long spears.
Sent 9: It might be they had other surprises for us.... But, confound it!
Sent 10: if we charged up the cave we should let them up behind us, and if we didn't those little brutes up the cave would probably get reinforced.
Sent 11: Heaven alone knew what tremendous engines of warfare--guns, bombs, terrestrial torpedoes--this unknown world below our feet, this vaster world of which we had only pricked the outer cuticle, might not presently send up to our destruction.
Sent 12: It became clear the only thing to do was to charge!
Sent 13: It became clearer as the legs of a number of fresh Selenites appeared running down the cavern towards us.
Question: Where are the Selenites in relation to the narrator?.
Example Output: 8, 13.

Example Input: Paragraph- Sent 1: Bin Ladin reportedly discussed the planes operation with KSM and Atef in a series of meetings in the spring of 1999 at the al Matar complex near Kandahar.
Sent 2: KSM's original concept of using one of the hijacked planes to make a media statement was scrapped, but Bin Ladin considered the basic idea feasible.
Sent 3: Bin Ladin, Atef, and KSM developed an initial list of targets.
Sent 4: These included the White House, the U.S. Capitol, the Pentagon, and the World Trade Center.
Sent 5: According to KSM, Bin Ladin wanted to destroy the White House and the Pentagon, KSM wanted to strike the World Trade Center, and all of them wanted to hit the Capitol.
Sent 6: No one else was involved in the initial selection of targets.
Sent 7: Bin Ladin also soon selected four individuals to serve as suicide operatives: Khalid al Mihdhar, Nawaf al Hazmi, Khallad, and Abu Bara al Yemeni.
Sent 8: During the al Matar meetings, Bin Ladin told KSM that Mihdhar and Hazmi were so eager to participate in an operation against the United States that they had already obtained U.S. visas.
Sent 9: KSM states that they had done so on their own after the suicide of their friend Azzam (Nashiri's cousin) in carrying out the Nairobi bombing.
Sent 10: KSM had not met them.
Sent 11: His only guidance from Bin Ladin was that the two should eventually go to the United States for pilot training.
Sent 12: Hazmi and Mihdhar were Saudi nationals, born in Mecca.
Sent 13: Like the others in this initial group of selectees, they were already experienced mujahideen.
Sent 14: They had traveled together to fight in Bosnia in a group that journeyed to the Balkans in 1995.
Sent 15: By the time Hazmi and Mihdhar were assigned to the planes operation in early 1999, they had visited Afghanistan on several occasions.
Sent 16: Khallad was another veteran mujahid, like much of his family.
Sent 17: His father had been expelled from Yemen because of his extremist views.
Sent 18: Khallad had grown up in Saudi Arabia, where his father knew Bin Ladin, Abdullah Azzam, and Omar Abdel Rahman (the "Blind Sheikh").
Question: Did the four bombers know the masterminds behind it?.
Example Output:
6, 10.