instruction:
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 (", ").
question:
Paragraph- Sent 1: In passing through these checkpoints, each of the hijackers would have been screened by a walk-through metal detector calibrated to detect items with at least the metal content of a .22-caliber handgun.
Sent 2: Anyone who might have set off that detector would have been screened with a hand wand-a procedure requiring the screener to identify the metal item or items that caused the alarm.
Sent 3: In addition, an X-ray machine would have screened the hijackers' carry-on belongings.
Sent 4: The screening was in place to identify and confiscate weapons and other items prohibited from being carried onto a commercial flight.
Sent 5: None of the checkpoint supervisors recalled the hijackers or reported anything suspicious regarding their screening.
Sent 6: While Atta had been selected by CAPPS in Portland, three members of his hijacking team-Suqami, Wail al Shehri, and Waleed al Shehri-were selected in Boston.
Sent 7: Their selection affected only the handling of their checked bags, not their screening at the checkpoint.
Sent 8: All five men cleared the checkpoint and made their way to the gate for American 11.
Sent 9: Atta, Omari, and Suqami took their seats in business class (seats 8D, 8G, and 10B, respectively).
Sent 10: The Shehri brothers had adjacent seats in row 2 (Wail in 2A, Waleed in 2B), in the firstclass cabin.
Sent 11: They boarded American 11 between 7:31 and 7:40.
Sent 12: The aircraft pushed back from the gate at 7:40.
Sent 13: Shehhi and his team, none of whom had been selected by CAPPS, boarded United 175 between 7:23 and 7:28 (Banihammad in 2A, Shehri in 2B, Shehhi in 6C, Hamza al Ghamdi in 9C, and Ahmed al Ghamdi in 9D).
Sent 14: Their aircraft pushed back from the gate just before 8:00.
Sent 15: Washington Dulles: American 77.
Sent 16: Hundreds of miles southwest of Boston, at Dulles International Airport in the Virginia suburbs of Washington, D.C., five more men were preparing to take their early morning flight.
Sent 17: At 7:15, a pair of them, Khalid al Mihdhar and Majed Moqed, checked in at the American Airlines ticket counter for Flight 77, bound for Los Angeles.
Sent 18: Within the next 20 minutes, they would be followed by Hani Hanjour and two brothers, Nawaf al Hazmi and Salem al Hazmi.
Question: Name the two men who checked in for Flight 77 in Dulles Airport at 7:15 a.m.
answer:
16, 17.

question:
Paragraph- Sent 1: (CNN) -- The body of a tourist was found off the coast of Thailand Tuesday, but six others remain missing after a ferry sank over the weekend near a popular diving destination, authorities said.
Sent 2: Survivors of the ferry sinking disembark the Thai police boat that rescued them.
Sent 3: The body is believed to be that of Austrian tourist Gabrielle Jetzinger, the Phuket Disaster Prevention and Mitigation Office told the Thai News Agency.
Sent 4: A Thai naval helicopter spotted the body floating face down about 12 nautical miles from Phuket's Promthep cape, and a Thai navy patrol retrieved the floating corpse.
Sent 5: The body has been sent to a government hospital for an autopsy, the agency reported.
Sent 6: Authorities are still searching for the five tourists and one crew member who remain missing.
Sent 7: They are thought to be German, Austrian, Japanese, Swiss and one Thai crew member, the news agency said.
Sent 8: The tourist boat, the Choke Somboon 19, was taking passengers from the Similan Islands to Phuket -- an area popular with tourists from around the world.
Sent 9: It capsized during a heavy storm Sunday night, said Lt. Sattawat Srirattanapong with the Phuket City police.
Sent 10: Survivors included 15 international tourists and eight Thais, who were picked up by a rescue boat Monday morning.
Sent 11: Phuket and the Similan Islands are famous for their diving spots, attracting international tourists each year from November to May.
Question: how was the survivors saved ?.
answer:
2, 3.

question:
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: What are electrical conductors?.
answer:
3, 4, 5, 6, 7, 8.