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: (CNN) -- Federal authorities are investigating threatening letters allegedly containing deadly ricin in Spokane, Washington, the FBI said Thursday.
Sent 2: The FBI and the U.S. Postal Inspection Service are trying to find the source of the two letters, intercepted Tuesday during a screening procedure at a postal facility in Spokane, FBI spokeswoman Ayn Sandalo Dietrich said.
Sent 3: "While we cannot offer further comment on this incident, we stress that law enforcement agencies will continue to assess and address the full spectrum of potential threats," she said.
Sent 4: The American Postal Workers Union was notified of the two suspicious letters by the Postal Service, the union said.
Sent 5: One letter was addressed to the Spokane Post Office and the other to a federal judge in Spokane, the union said.
Sent 6: Both were postmarked May 14, the union said.
Sent 7: Postal Service management told employees they weren't at risk from handling the letters because the suspected substance was not in a form that could be inhaled or readily ingested, the union said.
Sent 8: Preliminary lab tests showed the substance to be ricin, the union said.
Sent 9: The union is monitoring the situation, President Cliff Guffey said.
Sent 10: "Our members' safety is our primary concern," he said in a statement.
Sent 11: In an apparently unrelated case, ricin-tainted letters sent to President Obama and others touched off high anxieties in Washington and elsewhere last month.
Sent 12: James Everett Dutschke, 41, of Tupelo, Mississippi, has been charged with possession and use of a biological agent as a weapon in connection with those letters sent to Obama and others.
Question: The FBI and the U.S. Postal Inspection Service are trying to find the source of the two letters which contained what?.

A: 1, 2.
****
Q: Paragraph- Sent 1: Have you ever felt a shock?
Sent 2: Maybe you had just walked across the carpet and touched something metal?
Sent 3: How is this similar to lightning?
Sent 4: Believe it or not, they are very similar.
Sent 5: They are both discharges of static electricity.
Sent 6: Lightning is static electricity on a grand scale.
Sent 7: Lightning discharges a lot of electric charge.
Sent 8: It happens all at once.
Sent 9: Unfortunately, this large discharge is not useful.
Sent 10: It is so large and so fast, it cannot be controlled.
Sent 11: You cant plug a toaster into a lightning bolt!
Sent 12: For most devices, a much smaller amount of electric charge is needed.
Sent 13: It must also be steady.
Sent 14: It cant come all in one big jolt.
Sent 15: Thats why we cant run our homes off of lightning.
Sent 16: Our homes need to have a steady and continuous supply of electric current.
Question: What can happen when you walk across a carpeted floor and touch metal?.

A: 1, 2.
****
Q: Paragraph- Sent 1: While this process moved along, diplomacy continued its rounds.
Sent 2: Direct pressure on the Taliban had proved unsuccessful.
Sent 3: As one NSC staff note put it, "Under the Taliban, Afghanistan is not so much a state sponsor of terrorism as it is a state sponsored by terrorists."Sent 4: In early 2000, the United States began a high-level effort to persuade Pakistan to use its influence over the Taliban.
Sent 5: In January 2000, Assistant Secretary of State Karl Inderfurth and the State Department's counterterrorism coordinator, Michael Sheehan, met with General Musharraf in Islamabad, dangling before him the possibility of a presidential visit in March as a reward for Pakistani cooperation.
Sent 6: Such a visit was coveted by Musharraf, partly as a sign of his government's legitimacy.
Sent 7: He told the two envoys that he would meet with Mullah Omar and press him on Bin Ladin.
Sent 8: They left, however, reporting to Washington that Pakistan was unlikely in fact to do anything," given what it sees as the benefits of Taliban control of Afghanistan."Sent 9: President Clinton was scheduled to travel to India.
Sent 10: The State Department felt that he should not visit India without also visiting Pakistan.
Sent 11: The Secret Service and the CIA, however, warned in the strongest terms that visiting Pakistan would risk the President's life.
Sent 12: Counterterrorism officials also argued that Pakistan had not done enough to merit a presidential visit.
Sent 13: But President Clinton insisted on including Pakistan in the itinerary for his trip to South Asia.
Sent 14: His one-day stopover on March 25, 2000, was the first time a U.S. president had been there since 1969.
Sent 15: At his meeting with Musharraf and others, President Clinton concentrated on tensions between Pakistan and India and the dangers of nuclear proliferation, but also discussed Bin Ladin.
Sent 16: President Clinton told us that when he pulled Musharraf aside for a brief, one-on-one meeting, he pleaded with the general for help regarding Bin Ladin."Sent 17: I offered him the moon when I went to see him, in terms of better relations with the United States, if he'd help us get Bin Ladin and deal with another issue or two."Sent 18: The U.S. effort continued.
Question: What were two reasons the Secret Service, the CIA and counterterrorism officials advised President Clinton not to visit Pakistan?.

A:
11, 12.
****