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.
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Question: Passage: Going west where gold is being found, Jan Morell and wife Mary meet in the Napa, California, valley with his prospector brother Frank, but soon hired gunmen Jack Welch and Hank Purvis steal the gold they have panned and kill Mary.
In town, Frank is killed, as well, and Jan seriously wounded. He is cared for by Felipe de Ortega and sister Elena, who explain that Welch and Purvis work for dishonest Mayor Thomas Ainsworth, who also stole the Ortega family's land and property. An approval of statehood for California could restore law and order, as well as citizens' rights.
Elena fears for their safety, but Jan joins forces with Felipe's men to create havoc in Ainsworth's life, rustling horses and stealing money. A new U.S. marshal, Henderson, places a $5,000 reward on him, but Jan nevertheless captures Purvis and threatens to lynch him if he does not confess to Ainsworth's misdeeds. Elizabeth Ainsworth now begins to understand her father's corrupt ways.
As the gunfighting intensifies, both Welch and Felipe are killed. Jan is arrested and faces the hangman, but Henderson believes in his innocence and is able to release him when statehood wins approval and a general amnesty is granted. Jan and Elena plan a new life together.

Answer: What is the first name of the person who hired someone to kill Mary?


Question: Passage: Nathan Ellis, a 9-year-old maths prodigy, has just lost his father in a car accident. Nathan is diagnosed with autism early in the film, and his father was the only one who was able to connect normally with him. Although Nathan values his mother, Julie, he shuns any physical contact with her and treats her as more of a caretaker than a parent. Wanting to make sure Nathan isn't distracted from his studies, Julie enrolls him in advanced classes at a new school. There, he comes under the tutelage of teacher Martin, also a math genius, who now suffers from multiple sclerosis. Martin sees himself in Nathan, once a promising young mind in the field of mathematics, who gave it all up once he was diagnosed with his illness.
Seven years later, Martin is preparing Nathan to compete for a place in the International Mathematical Olympiad, a prestigious high school competition consisting of the world's best young mathematicians. This year, it is to be held at Cambridge, after a two-week math camp in Taiwan where the students will study for the test that determines the winners. Nathan fears he's not good enough to qualify but ends up doing well enough to accompany 15 other British teenagers to Taiwan.
Suddenly thrust out of his comfort zone, Nathan finds himself no longer the smartest math whiz in the room, and his social anxieties nearly paralyze his performance. He has trouble reading the social cues of others and flinches at the slightest physical contact with another person. Nathan is paired with a female Chinese student, Zhang Mei, who slowly helps him adjust to his new surroundings and helps him fight through his fears. By the skin of their teeth, Nathan and Zhang make the cut to compete in Cambridge.

Answer: Who comes under the tutelage of a math genius teacher?


Question: Passage: The Aurora arrived at Cape Denison on 13 January 1913. When Mawson's party failed to return, Davis sailed her east along the coast as far as the Mertz Glacier tongue, searching for the party. Finding no sign and reaching the end of the navigable ice-free water, they returned to Cape Denison. The oncoming winter concerned Davis, and on 8 February—just hours before Mawson's return to the hut—the ship departed Commonwealth Bay, leaving six men behind as a relief party. Upon Mawson's return, the Aurora was recalled by wireless radio, but powerful katabatic winds sweeping down from the plateau prevented the ship's boat from reaching the shore to collect the men.The Aurora returned to Cape Denison the following summer, in mid-December, to take the men home. The delay may have saved Mawson's life; he later told Phillip Law, then-director of Australian National Antarctic Research Expeditions (ANARE), that he did not believe he could have survived the sea journey so soon after his ordeal.The cause of Mawson and Mertz's illnesses remains in part a mystery. At the time, McLean—the expedition's chief surgeon and one of the men who had remained at Cape Denison—attributed their sickness to colitis; Mawson wrote in The Home of the Blizzard, his official account of the expedition, that Mertz died of fever and appendicitis. A 1969 study by Sir John Cleland and R. V. Southcott of the University of Adelaide concluded that the symptoms Mawson described—hair, skin and weight loss, depression, dysentery and persistent skin infections—indicated the men had suffered hypervitaminosis A, an excessive intake of vitamin A. This is found in unusually high quantities in the livers of Greenland Huskies, of which both Mertz and Mawson consumed large amounts.While hypervitaminosis A is the generally accepted medical diagnosis for Mertz's death and Mawson's illness, the theory has its detractors. Law believed it was "completely unproven ... The symptoms that were described are exactly the ones you get from cold exposure. You don't have to predicate a theory of this sort to explain the soles coming off your feet." A 2005 article in The Medical Journal of Australia by Denise Carrington-Smith suggested it may have been "the psychological stresses related to the death of a close friend and the deaths of the dogs he had cared for", and a switch from a predominately vegetarian diet that killed Mertz, not hypervitaminosis A.

Answer:
What were the last names of the men Cleland and Southcott indicated had suffered hypervitaminosis A?