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.

Ex Input:
Passage: The Willamette River ( (listen) wil-AM-it) is a major tributary of the Columbia River, accounting for 12 to 15 percent of the Columbia's flow. The Willamette's main stem is 187 miles (301 km) long, lying entirely in northwestern Oregon in the United States. Flowing northward between the Oregon Coast Range and the Cascade Range, the river and its tributaries form the Willamette Valley, a basin that contains two-thirds of Oregon's population, including the state capital, Salem, and the state's largest city, Portland, which surrounds the Willamette's mouth at the Columbia.
Originally created by plate tectonics about 35 million years ago and subsequently altered by volcanism and erosion, the river's drainage basin was significantly modified by the Missoula Floods at the end of the most recent ice age. Humans began living in the watershed over 10,000 years ago. There were once many tribal villages along the lower river and in the area around its mouth on the Columbia. Indigenous peoples lived throughout the upper reaches of the basin as well.
Rich with sediments deposited by flooding and fed by prolific rainfall on the western side of the Cascades, the Willamette Valley is one of the most fertile agricultural regions in North America, and was thus the destination of many 19th-century pioneers traveling west along the Oregon Trail. The river was an important transportation route in the 19th century, although Willamette Falls, just upstream from Portland, was a major barrier to boat traffic. In the 21st century, major highways follow the river, and roads cross it on more than 50 bridges.
Since 1900, more than 15 large dams and many smaller ones have been built in the Willamette's drainage basin, 13 of which are operated by the U.S. Army Corps of Engineers (USACE). The dams are used primarily to produce hydroelectricity, to maintain reservoirs for recreation, and to prevent flooding. The river and its tributaries support 60 fish species, including many species of salmon and trout; this is despite the dams, other alterations, and pollution (especially on the river's lower reaches). Part of the Willamette Floodplain was established as a National Natural Landmark in 1987 and the river was named as one of 14 American Heritage Rivers in 1998.

Ex Output:
What organization operates 13 of the dams built in the river that is a major tributary of the Columbia river?


Ex Input:
Passage: After the Wicked Witch of the West is melted by a bucket of water, and Dorothy is sent back to her world, Glinda, the Good Witch of the South, decides to revive the Wicked Witch and remove her powers by storing them in a magic broom. Glinda then gives the magical broom to Dorothy's friends, Tin Woodman, Cowardly Lion, and Scarecrow, and they become the guardians of the broom.
Evilene, the Wicked Witch, conspires with her Flying Monkeys to retrieve her broom. However, a friendly little monkey named Ozzy forgets to close the gate of the castle and a battle ensues between the flying monkeys and the 'Bums of Oz.' Evilene retrieves her broom and repels the Champions of Oz from the castle. She then punishes Ozzy's father, transforming him into a chicken. Angered by the witch's spell on his father, Ozzy steals the broom from Evilene and runs away from the palace.
Ozzy reaches Glinda to find she has been paralyzed by accidentally drinking a magic potion created by her niece Gabby, who is unable to create an antidote without a vital ingredient based on wood. Gabby and Ozzy set off to find the Champions of Oz. They are pursued by the other Flying Monkeys.
They soon find Cowardly Lion, who is out of sorts due to the witch's spell, but with some effort they guide him to the north town, where they find the Tin Woodman, who is extremely depressed by the spell. The spell-raged Lion smashes the Tin Man to bits, but calms down when Ozzy accidentally hits him with the magic broom.
Ozzy, Gaby, and the Cowardly Lion take the Tin Man's parts to the Library of Oz where (due to the spell) Scarecrow is obsessively reading books in an effort to become more intelligent. He quickly repairs Tin with the help from a clue. However, the group is attacked by the Flying Monkeys, and in the chaos Ozzy cures Scarecrow of the spell's effects, but they are unable to save Gabby from being whisked away by the Flying Monkeys.

Ex Output:
What are the names of the people who are pursued by Flying Monkeys?


Ex Input:
Passage: So Dark the Night is the story of a detective, Henri Cassin from Paris, who, while on a long overdue vacation, falls in love with innkeeper Pierre Michaud's daughter Nanette. She is a country girl with a jealous boyfriend. Nonetheless, the detective becomes engaged to her. Then, the night of her engagement party, the girl vanishes and later turns up dead. Cassin believes that the obvious suspect is Leon, the old boyfriend, but soon he is also found killed. Soon after Mama receives a warning that she will be the next to die, she is found strangled.
Pierre, fearing for his safety, decides to sell the inn. Henri returns to Paris and, because of his investigative skill, he is able to come up with a sketch of the killer by expanding and elaborating on information provided by a footprint found beside Leon's body. 
To Henri's astonishment, the sketch bears the exact likeness of himself, and when he fits his shoe into the footprint, he realizes that he is undoubtedly the killer. After making a full confession to the police commissioner, Henri is evaluated by a psychiatrist, who determines that he is schizophrenic. Though placed under watch of a guard, Henri escapes back to St. Margot, where he tries to strangle Pierre. However, the police commissioner, who has followed Henri to the village, catches the detective in the act and shoots him.

Ex Output:

Who vanishes and turns up dead?