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 (", ").

Paragraph- Sent 1: About 20 minutes later, at 7:35, another passenger for Flight 77, Hani Hanjour, placed two carry-on bags on the X-ray belt in the Main Terminal's west checkpoint, and proceeded, without alarm, through the metal detector.
Sent 2: A short time later, Nawaf and Salem al Hazmi entered the same checkpoint.
Sent 3: Salem al Hazmi cleared the metal detector and was permitted through; Nawaf al Hazmi set off the alarms for both the first and second metal detectors and was then hand-wanded before being passed.
Sent 4: In addition, his over-the-shoulder carry-on bag was swiped by an explosive trace detector and then passed.
Sent 5: The video footage indicates that he was carrying an unidentified item in his back pocket, clipped to its rim.
Sent 6: When the local civil aviation security office of the Federal Aviation Administration (FAA) later investigated these security screening operations, the screeners recalled nothing out of the ordinary.
Sent 7: They could not recall that any of the passengers they screened were CAPPS selectees.
Sent 8: We asked a screening expert to review the videotape of the hand-wanding, and he found the quality of the screener's work to have been "marginal at best."Sent 9: The screener should have "resolved" what set off the alarm; and in the case of both Moqed and Hazmi, it was clear that he did not.
Sent 10: At 7:50, Majed Moqed and Khalid al Mihdhar boarded the flight and were seated in 12A and 12B in coach.
Sent 11: Hani Hanjour, assigned to seat 1B (first class), soon followed.
Sent 12: The Hazmi brothers, sitting in 5E and 5F, joined Hanjour in the first-class cabin.
Sent 13: Newark: United 93.
Sent 14: Between 7:03 and 7:39, Saeed al Ghamdi, Ahmed al Nami, Ahmad al Haznawi, and Ziad Jarrah checked in at the United Airlines ticket counter for Flight 93, going to Los Angeles.
Sent 15: Two checked bags; two did not.
Sent 16: Haznawi was selected by CAPPS.
Sent 17: His checked bag was screened for explosives and then loaded on the plane.
Sent 18: The four men passed through the security checkpoint, owned by United Airlines and operated under contract by Argenbright Security.
Question: who were the people that went through the metal detector without any problems.
1, 3.

Paragraph- Sent 1: (CNN) -- In November 2009, Norwegian freelance journalist Paul Refsdal is riding in a pick-up truck on a dusty track of Afghan road.
Sent 2: The Taliban have kidnapped him.
Sent 3: If the truck turns right, he knows he's being sold to another militant group.
Sent 4: A left turn means his kidnappers have decided to let him go.
Sent 5: His journey started when Refsdal, who wanted to document the daily lives of the Taliban, accepted the invitation of a Taliban commander to film him and his fighters.
Sent 6: Refsdal later accompanied another Taliban commander, Omar, to his hideout on a second embed.
Sent 7: As part of CNN's "Taliban" documentary, Refsdal talked with CNN's Anderson Cooper about going from invited guest to kidnap victim -- a harrowing experience that began the way it later ended, with Refsdal in a truck.
Sent 8: Here is an edited excerpt: REFSDAL: We rent a pickup truck and we drive into this valley that doesn't really have a road.
Sent 9: I'm told it is not possible to drive anymore.
Sent 10: We will have to walk for several hours up the hillside to one village, and we have to sneak a little bit.
Sent 11: Omar is very particular about I should cover my face.
Sent 12: I assume this is because they don't want informers to see that there's a foreigner coming.
Sent 13: And we sleep in a house, and everything seems OK. Then, the next day we are asked to go to another house, just 100 meters down the hillside.
Sent 14: We have to wait there, because they're going to have a meeting.
Sent 15: After a couple hours, one of the fighters comes and says he's from al Qaeda.
Sent 16: And he says that he has information that I was spying for the coalition, so both my translator and I will be executed tonight.
Sent 17: And he goes on, saying that we're going to be killed with a knife.
Sent 18: ... He explains how much he hates foreigners and he wants to eat the flesh of foreigners.
Question: Why did Refsdal walk for several hours up a hillside on his way to meet the Taliban fighters?.
8, 9, 10.

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: In total, how many people are included in this account?.
8, 9, 10, 13, 16.