In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: Willow has been cut and used on the Levels since mankind moved into the area. Fragments of willow basket were found near the Glastonbury Lake Village, and it was used in the construction of several Iron Age causeways. The willow was harvested using traditional methods of pollarding, where a tree would be cut back to the main stem. New shoots of willow, called "withies", would grow out of the trunk and these would be cut periodically for use.During the 1930s, over 9,000 acres (36 km2) of willow were being grown commercially on the Levels. Largely because of the replacement of baskets by plastic bags and cardboard boxes, the industry has severely declined since the 1950s. By the end of the 20th century only about 350 acres (1.4 km2) were grown commercially, near the villages of Burrowbridge, Westonzoyland, and North Curry. The Somerset Levels is now the only area in the UK where basket willow is grown commercially. For weaving, the species Salix triandra (almond willow, black maul) is grown, while Salix viminalis (common osier) is ideal for handles, bases, and the structural members in furniture and hurdles. Historically willow was used to make salmon traps or "putchers". Products including baskets, eel traps (kypes), lobster pots, and furniture were widely made from willow throughout the area in the recent past. Among the more unusual products still made are passenger baskets for hot air balloons, the frames inside the Bearskins worn by the regiments of the Grenadier Guards, and an increasing number of willow coffins.Another use of willow has been found by the Coate family, who make artists' charcoals in Stoke St Gregory. It has become in 30 years the leading artists' charcoal manufacturer in Europe, producing most of the natural charcoals sold under different art-material brands.The industry is celebrated in the form of the Willow Man (sometimes known as the Angel of the South), a willow sculpture, 40 feet (12.2 m) tall, produced by artist Serena de la Hey in September 2000 that can be seen from the railway and the M5 motorway to the north of Bridgwater. At Stoke St Gregory there is also a Willows and Wetlands Visitor Centre.
What is the name of the family that is the leading artists' charcoal manufacturer in Europe?

Passage: As of the 2010 U.S. census, the racial composition was as follows:
White: 63.8%
Black or African American: 18.6%
American Indian: 2.0%
Asian: 5.6% (1.9% Hmong, 0.9% Chinese, 0.7% Indian, 0.6% Korean, 0.4% Vietnamese, 0.3% Thai, 0.3% Laotian, 0.2% Filipino, 0.1% Japanese, 0.2% Other Asian)
Native Hawaiian/Pacific Islander: 0.1%
Other: 5.6%
Multiracial: 4.4%
Hispanic or Latino (of any race): 10.5% (7.0% Mexican, 1.3% Ecuadorian, 0.4% Puerto Rican, 0.3% Guatemalan, 0.2% Salvadoran, 1.3% Other Latino)White Americans make up about three-fifths of Minneapolis's population. This community is predominantly of German and Scandinavian descent. There are 82,870 German Americans in the city, making up over one-fifth (23.1%) of the population. The Scandinavian-American population is primarily Norwegian and Swedish. There are 39,103 Norwegian Americans, making up 10.9% of the population; there are 30,349 Swedish Americans, making up 8.5% of the city's population. Danish Americans are not nearly as numerous; there are 4,434 Danish Americans, making up only 1.3% of the population. Norwegian, Swedish, and Danish Americans together make up 20.7% of the population. This means that ethnic Germans and Scandinavians together make up 43.8% of Minneapolis's population, and make up the majority of Minneapolis's non-Hispanic white population. Other significant European groups in the city include those of Irish (11.3%), English (7.0%), Polish (3.9%), French (3.5%) and Italian (2.3%) descent. African Americans make up 18.6% of the city's population, with a large fraction hailing from Rust Belt cities such as Chicago and Gary, Indiana over the past three decades.
There are 10,711 individuals who identify as multiracial in Minneapolis: People of black and white ancestry number at 3,551, and make up 1.0% of the population. People of white and Native American ancestry number at 2,319, and make up 0.6% of the population. Those of white and Asian ancestry number at 1,871, and make up 0.5% of the population. Lastly, people of black and Native American ancestry number at 885, and make up 0.2% of Minneapolis's population.
As of 2010, what percentage of people in Minneapolis were American Indian?

Passage: Buckton was a small highland enclosure castle with a 2.8-metre-thick (9 ft) sandstone curtain wall; nothing survives above ground. It is roughly oval and measures 35.6 by 26.2 metres (117 by 86 ft), covering an area of 730 square metres (0.18 acres). The castle is surrounded by a 10-metre-wide (33 ft) ditch apart from the south-west part where the steep slope of the hill makes the ditch unnecessary. When the ditch was dug some of the material was used to raise the interior of the castle by 1.5 metres (4 ft 11 in).Buckton is similar in size to Clitheroe Castle's inner enclosure, which is also oval (31.8 by 26 metres (104 by 85 ft)) and has a 2.6-metre-thick (9 ft) curtain wall. Clitheroe was also built on a rocky peak and the small size of its great tower may be due to its naturally defensible position and location in an economically deprived area.Buckton Castle was entered through a gatehouse in the north-west measuring 9.3 by 7.5 metres (31 by 25 ft). The east side was occupied by the gate passage and the west by a chamber. Though the structure no longer survives above ground, it was probably at least two storeys tall. Constructed in the 12th century, Buckton's gatehouse was the earliest in North West England, and was one of six stone gatehouses in the region that were built in the 12th or 13th centuries: Buckton, Egremont, Brough, Clitheroe, Carlisle's inner gatehouse, and the Agricola Tower at Chester. They are broadly similar in size, and take the form of a gate passage piercing a single tower with rooms in the floors above. Buckton's gatehouse differs slightly in having the passage offset to one side.In the 1770s, the antiquarian Thomas Percival recorded a well within the castle, close to the south curtain, and walls of buildings inside the castle still standing to a height of 2 metres (7 ft). A plan created by the Saddleworth Geological Society in 1842 recorded a ruined structure within the castle's south-east area in addition to the well Percival noted. Trenches in the castle's interior did not reveal the structures on the plans from the 18th and 19th centuries, although the discovery of a posthole indicates there was activity in this area. The gap in the southern part of the curtain wall – not evident in the 1842 plan by the Saddleworth Geological Society – was probably created in the 19th century. There is a feature resembling a spoil heap, consisting of pieces of sandstone. This may have been a by-product from the construction of the castle. Nothing remains of Buckton Castle above ground today, and until the late 20th century, vegetation obscured the existence of a stone structure.

What are the exact names of the six stone gatehouses built in North West England in the 12th or 13th centuries?