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 (", ").
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Question: 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?.

Answer: 1, 2.

Question: Paragraph- Sent 1: { { Plot } } In a two-dimensional world called Flatland populated by living squares , triangles , lines , circles and other two-dimensional shapes , it is three days until the celebration of the year 3000 .
Sent 2: A Square , attorney at law , struggles to instruct his son , A Hexagon , in the art of sight recognition .
Sent 3: The lesson is interrupted by A Square 's brother B , a clerk to President Circle , warning A to stay home during a meeting at the Senate of the Great Southern Republic of Flatland .
Sent 4: The Senate session has been called to discuss the increasing hostilities between the government and the Chromatist movement , led by Senator Chromatistes , an irregular dodecagon .
Sent 5: The movement seeks legalization of the right of Flatlanders to color their sides as they see fit .
Sent 6: Traditionally taboo , laws against it had been relaxed ; this emboldened the Chromatists to demand legalization .
Sent 7: The Great Southern Republic distinguishes itself from its enemy , the Northern Kingdom , by its stances on Chromatism and Irregulars along with a democratic government .
Sent 8: Relaxing the laws has already been perceived as weakness by the Northern Kingdom who are massing on the borders .
Sent 9: Against his brother s warning , A Square meets his new client , the first female charged as a Chromatist ; on his way home he is caught in the melee leaving the Senate .
Sent 10: President Circle s soldiers killed Senator Chromatistes and his supporters , sparking a riot across the city .
Sent 11: A Square just gets home safely , then barricades his family against the chaos for the night .
Question: Why does A Square barricade his family for the night?.

Answer: 9, 10.

Question: Paragraph- Sent 1: New Horizons: Exhausted after the Civil War, Spain remained on the sidelines during World War II and began to recover economically under the oppressive, law-and-order regime of Franco.
Sent 2: There had been a foretaste of elite foreign tourism in the 1920s, but it was the late 1950s when the rest of Europe began sun-seeking pilgrimages to Spain.
Sent 3: Tourism exploded into an annual southern migration, transforming the Spanish economy, landscape, and society.
Sent 4: Eager to capitalize, the country poured its soul into mass tourism, which triggered a rash of indiscriminate building on the southern and eastern coastlines, with scant regard for tradition or aesthetics.
Sent 5: But after so many years closed off from the rest of Europe, of equal significance was the injection of foreign influences into Franco's once hermetically sealed Spain.
Sent 6: Mallorca and Menorca in particular saw explosive growth in tourism; by the 1970s, the Balearics were one of Europe's most popular holiday destinations.
Sent 7: Franco named as his successor the grandson of Alfonso XIII, who was enthroned as King Juan Carlos I when the dictator died in 1975.
Sent 8: To the dismay of Franco diehards, the king brilliantly managed the transition to democracy, then stood back to allow it full rein, even intervening during a brief attempt at a military coup.
Sent 9: After many years of repression, new freedoms and autonomy were granted to Spanish regions, including the Balearics, and their languages and cultures enjoyed a long-desired renaissance.
Sent 10: More a part of Europe than ever before, Spain joined the European Community (now European Union) in 1986, giving further boost to a booming economy.
Sent 11: The tourist industry continued to expand, and though it became one of the top two income earners in Spain, a realization that unrestricted mass tourism was leading to damaging long-term consequences also began to grow.
Sent 12: By the late 1990s, a new emphasis on quality and, especially in the Balearics, on safeguarding the environment had finally taken roottoo late for many environmentalists, but hopefully still in time to preserve much of the natural beauty and unique character of the Las Islas Baleares.
Question: Why did a new emphasis on quality and on safeguarding the environment take root in Spain in the late 1990s?.

Answer:
11, 12.