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.
Example: Passage: Nearing London, Oliver encounters Jack Dawkins, a pickpocket more commonly known by the nickname the "Artful Dodger", and his sidekick, a boy of a humorous nature named Charley Bates, but Oliver's innocent and trusting nature fails to see any dishonesty in their actions. The Dodger provides Oliver with a free meal and tells him of a gentleman in London who will "give him lodgings for nothing, and never ask for change". Grateful for the unexpected assistance, Oliver follows the Dodger to the "old gentleman's" residence. In this way Oliver unwittingly falls in with an infamous Jewish criminal known as Fagin, the gentleman of whom the Artful Dodger spoke. Ensnared, Oliver lives with Fagin and his gang of juvenile pickpockets in their lair at Saffron Hill for some time, unaware of their criminal occupations. He believes they make wallets and handkerchiefs.
Example solution: Who believes Fagin's gang make wallets and handkerchiefs?.
Example explanation: This question is based on the following sentence in the passage "He believes they make wallets and handkerchiefs". It evaluates the understanding that the pronoun "he" refers to name "Oliver". You can ask questions like this one about most pronouns in a paragraph.

Problem: Passage: BookWars is a creative documentary which is told in an unconventional, narrative style. The film opens with the narrator (who is also the film's director) driving out West along a desert highway, relating to the audience his previous experiences as a streetside bookseller in New York City. The entire documentary – including the central events involving his experiences among the street booksellers in New York – is thus "told" as a long conversation.
The narrator describes his post-graduation years in New York, and how he ended up at one point virtually penniless. Driven by a desperate need to pay the rent, he resorts to wheeling his own books out to the street to try to sell them. He reveals that he was not only successful in making a significant amount of cash on that first day, but he has also met a variety of interesting and strange characters of the streets of New York – including other street booksellers.
A motley assortment of street booksellers on West 4th street, in Greenwich Village, New York City, are first introduced. Among them: "Slick" Rick Sherman, a semi-professional magician; Al Mappo, so named because he only sells maps and atlases; Emil, who says only he "escaped", though we do not know from where; and Pete Whitney: King of the booksellers, toad collector, and collage artist.
BookWars next introduces another group of street booksellers who hawk their trade on nearby 6th Avenue. Mainly black and minority individuals, they ply books and magazines in parallel fashion to the nearby West 4th street booksellers, who are primarily white. The booksellers on 6th Avenue suffer greater exposure to the law, with many claiming this to be due to racial profiling.
Some of the significant personalities that are introduced on 6th Avenue include: Marvin, always wearing his trademark black hat; and Ron, from Jamaica – charismatic, streetwise and outspoken.
Solution: What are the first names of the motley assortment of street booksellers that are introduced?