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: Dick was enraged to see how contentedly the men bore the irksome confinement, the meager food, and harsh peremptoriness of the beardless boys set over them as guards.
Sent 2: Most of the prisoners passed the time in cards, playing for buttons, trinkets, or what not that formed their scanty possessions.
Sent 3: Dick learned that all the commissioned officers of the company with Wesley Boone had been wounded or killed in the charge near the stone bridge.
Sent 4: Wesley had been with the prisoners at first.
Sent 5: He had been struck on the head, and was in a raging fever when his father and sister came to the prison to take him away.
Sent 6: No one could tell where he was now, but Dick knew that he must be in the city, since there were no exchanges, the Confederates allowing no one to leave the lines except women with the dead, or those who came from the North on special permits.
Sent 7: Then he visited the provost headquarters, and was shown the complete list of names recorded in the books there; but Barney's was not among them.
Sent 8: At the Spottswood Hotel, the day after his coming, he met Elisha Boone, haggard, depressed, almost despairing.
Sent 9: Dick had no love for the hard-headed plutocrat, but he couldn't resist making himself known.
Question: Where did Dick visit after his stop at the provost headquarters?.
7, 8.

Paragraph- Sent 1: Born on May 11, 1975, in Mazraa, Lebanon, Ziad Jarrah came from an affluent family and attended private, Christian schools.
Sent 2: Like Atta, Binalshibh, and Shehhi, Jarrah aspired to pursue higher education in Germany.
Sent 3: In April 1996, he and a cousin enrolled at a junior college in Greifswald, in northeastern Germany.
Sent 4: There Jarrah met and became intimate with Aysel Senguen, the daughter of Turkish immigrants, who was preparing to study dentistry.
Sent 5: Even with the benefit of hindsight, Jarrah hardly seems a likely candidate for becoming an Islamic extremist.
Sent 6: Far from displaying radical beliefs when he first moved to Germany, he arrived with a reputation for knowing where to find the best discos and beaches in Beirut, and in Greifswald was known to enjoy student parties and drinking beer.
Sent 7: Although he continued to share an apartment in Greifswald with his cousin, Jarrah was mostly at Senguen's apartment.
Sent 8: Witnesses interviewed by German authorities after 9/11, however, recall that Jarrah started showing signs of radicalization as early as the end of 1996.
Sent 9: After returning from a trip home to Lebanon, Jarrah started living more strictly according to the Koran.
Sent 10: He read brochures in Arabic about jihad, held forth to friends on the subject of holy war, and professed disaffection with his previous life and a desire not to leave the world "in a natural way."Sent 11: In September 1997, Jarrah abruptly switched his intended course of study from dentistry to aircraft engineering-at the Technical University of Hamburg-Harburg.
Sent 12: His motivation for this decision remains unclear.
Sent 13: The rationale he expressed to Senguen-that he had been interested in aviation since playing with toy airplanes as a child-rings somewhat hollow.
Sent 14: In any event, Jarrah appears already to have had Hamburg contacts by this time, some of whom may have played a role in steering him toward Islamic extremism.
Sent 15: Following his move to Hamburg that fall, he began visiting Senguen in Greifswald on weekends, until she moved to the German city of Bochum one year later to enroll in dental school.
Sent 16: Around the same time, he began speaking increasingly about religion, and his visits to Senguen became less and less frequent.
Sent 17: He began criticizing her for not being religious enough and for dressing too provocatively.
Sent 18: He grew a full beard and started praying regularly.
Question: WHEN DID JARRAH SWITCH HIS COURSE OF STUDY?.
11.