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 (", ").

Q: Paragraph- Sent 1: Right after the Pentagon was hit, NEADS learned of another possible hijacked aircraft.
Sent 2: It was an aircraft that in fact had not been hijacked at all.
Sent 3: After the second World Trade Center crash, Boston Center managers recognized that both aircraft were transcontinental 767 jetliners that had departed Logan Airport.
Sent 4: Remembering the "we have some planes" remark, Boston Center guessed that Delta 1989 might also be hijacked.
Sent 5: Boston Center called NEADS at 9:41 and identified Delta 1989, a 767 jet that had left Logan Airport for Las Vegas, as a possible hijack.
Sent 6: NEADS warned the FAA's Cleveland Center to watch Delta 1989.
Sent 7: The Command Center and FAA headquarters watched it too.
Sent 8: During the course of the morning, there were multiple erroneous reports of hijacked aircraft.
Sent 9: The report of American 11 heading south was the first; Delta 1989 was the second.
Sent 10: NEADS never lost track of Delta 1989, and even ordered fighter aircraft from Ohio and Michigan to intercept it.
Sent 11: The flight never turned off its transponder.
Sent 12: NEADS soon learned that the aircraft was not hijacked, and tracked Delta 1989 as it reversed course over Toledo, headed east, and landed in Cleveland.
Sent 13: But another aircraft was heading toward Washington, an aircraft about which NORAD had heard nothing: United 93.
Sent 14: United Airlines Flight 93 FAA Awareness.
Sent 15: At 9:27, after having been in the air for 45 minutes, United 93 acknowledged a transmission from the Cleveland Center controller.
Sent 16: This was the last normal contact the FAA had with the flight.
Sent 17: Less than a minute later, the Cleveland controller and the pilots of aircraft in the vicinity heard "a radio transmission of unintelligible sounds of possible screaming or a struggle from an unknown origin."Sent 18: The controller responded, seconds later: "Somebody call Cleveland?"This was followed by a second radio transmission, with sounds of screaming.
Question: Which air traffic center communicated with United 93?.

A: 14, 15.
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Q: Paragraph- Sent 1: In 1990, the U.S. Custom House in New York City was renamed after Hamilton.
Sent 2: In 1880, his son John Church Hamilton commissioned Carl Conrads to sculpt a granite statue, now located in Central Park, New York City.
Sent 3: One statue honoring Alexander Hamilton in Chicago was mired in controversy, at least concerning the surrounding architecture.
Sent 4: Kate Sturges Buckingham (1858-1937), of the Buckingham Fountain family, commissioned the monument.
Sent 5: Its impetus was that Treasury Secretary Hamilton "secured the nation's financial future and made it possible for her own family to make its fortune in grain elevators and banking.
Sent 6: Consequently, John Angel was hired to model a figurative sculpture and the Finnish architect Eliel Saarinen was to create a "colossal architectural setting" for it.
Sent 7: The proposed 80-foot tall columned shelter was poorly received.
Sent 8: By Ms. Buckingham's death in 1937, the sculpture's setting.
Sent 9: location and design were uncertain.
Sent 10: Conspiracy allegations surfaced, and the matter became mired in litigation.
Sent 11: After the courts ordered the construction to be completed by 1953, the trustees hired architect Samuel A. Marx.
Sent 12: The structure was completed, had structural problems, and was eventually demolished in 1993.
Sent 13: The statue was gilded, and is still on display.
Sent 14: A statue, by James Earle Fraser, was dedicated on May 17, 1923, on the south terrace of the Treasury Building, in Washington.
Question: When was Kate Sturges Buckingham born?.

A: 4.
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Q: Paragraph- Sent 1: Tropical climates are found around the equator.
Sent 2: These climates have warm temperatures year round.
Sent 3: Tropical climates may be very wet or wet and dry.
Sent 4: Tropical wet climates occur at or very near the equator.
Sent 5: They have high rainfall year round.
Sent 6: Tropical rainforests grow in this type of climate.
Sent 7: Tropical wet and dry climates also occur near the equator.
Sent 8: They receive less rainfall.
Sent 9: Most of the rain falls in a single season.
Sent 10: The rest of the year is dry.
Sent 11: Few trees can withstand the long dry season.
Sent 12: The main plants are grasses.
Sent 13: Dry climates receive very little rainfall.
Sent 14: They also have high rates of evaporation.
Sent 15: This makes them even drier.
Sent 16: Deserts can get less than 25 centimeters of rain per year.
Sent 17: Thats less than 10 inches per year.
Sent 18: How much rain do you get at your house?.
Question: Where do tropical rainforests grow?.

A:
4, 6.
****