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 two main requirements of an anti-torque system are that it should prevent rotation of the sonde, and it should allow easy movement of the drill up and down the borehole.  Attempts have been made to design drills with counter-rotating components so that overall torque is minimized, but these have had limited success.  Five kinds of anti-torque systems have been devised for use with cable-suspended EM drills, though not all are in current use, and some drills have used a combination of more than one design.  The first drill to require an anti-torque system was used at Camp Century by CRREL in 1966; the drill incorporated a set of hinged friction blades that swung out from the sonde when the drill motor was started.  These were found to have very weak friction against the borehole wall, and were ineffective; the drill had to be controlled carefully to prevent twisting the cable.  No other drills have attempted to use this approach.For the next deployment of the drill leaf springs were installed, and this has proved to be a more durable design.  These are mounted vertically, with a curve outwards so that they are easily compressed by the borehole wall, and can slide up and down with the movement of the drill.  They pass easily through any areas of irregularity in the borehole, but the edges of the springs cut into the borehole wall and prevent rotation.  Leaf springs are very simple mechanically, with the additional benefit of being easy to adjust by changing the spacing between the end points.  They can be placed anywhere on the drill that does not rotate, so they do not add length to the sonde.  The shape is usually a fourth-order parabola, since this has been determined to provide the most even loading against the borehole wall.  Leaf springs have been found to be so effective that they can prevent rotation even in heavy drills running at full power.Skate antitorque systems have blades attached to vertical bars which are pushed against the borehole wall; the blades dig into the wall and provide the anti-torque.  Skates can be built with springs which allow them to keep the blades pressed against the wall in an irregular borehole, and to prevent problems in narrower parts of the borehole.  Although skates are a popular design for anti-torque and have been used with success, they have difficulty preventing rotation in firn and at boundaries between layers of different densities, and can cause problems when drilling with high torque.  When they fail, they act as reamers, removing chips from the wall which can fall to the drillbit and interfere with drilling.

Ex Output:
What acts as reamers when they fail?


Ex Input:
Passage: Radiohead began work on their ninth studio album in September 2014, joined again by Godrich. In 2015 they resumed work in the La Fabrique studio near Saint-Rémy-de-Provence, France. The sessions were marred by the death of Godrich's father, and Yorke's separation from his wife, Rachel Owen, who died of cancer several months after the album's completion. In the same year, Yorke contributed a soundtrack, Subterranea, to The Panic Office, an installation of Radiohead artwork in Sydney, Australia, and Junun, a collaboration between Greenwood, Godrich, Israeli composer Shye Ben Tzur and Indian musicians, was released, accompanied by a documentary directed by Anderson. On Christmas Day 2015, Radiohead released a new song, "Spectre", on the audio streaming site SoundCloud. It had been commissioned for the 2015 James Bond film Spectre, but was rejected by the film producers as "too dark".Radiohead's ninth studio album, A Moon Shaped Pool, was released in May 2016 on Radiohead's website and online music stores, followed by retail versions in June via XL Recordings. It was promoted with music videos for the singles "Burn the Witch" and "Daydreaming", the latter directed by Anderson. The album includes several songs written years earlier, including "True Love Waits", and strings and choral vocals arranged by Jonny Greenwood and performed the London Contemporary Orchestra. It was Radiohead's sixth UK number-one album and reached number three in the US. It was the fifth Radiohead album nominated for the Mercury Prize, making Radiohead the most shortlisted act in the award's history, and was nominated for Best Alternative Music Album and Best Rock Song (for "Burn the Witch") at the 59th Annual Grammy Awards. It appeared on several publications' lists of the best albums of the year.

Ex Output:
What is the name of the song that had a music video directed by Anderson?


Ex Input:
Passage: James Longacre died suddenly at his home in Philadelphia on January 1, 1869.  A memorial meeting was held at the Philadelphia Mint on January 5, attended by the facility's employees. The Director of the Mint, Henry Linderman, delivered a speech in praise of Longacre prior to the formal eulogy, which was given by Longacre's assistant, William Barber, who would be appointed as Longacre's successor.  Like each of his predecessors, Longacre died in office.Longacre was recognized in an exhibit of 100 notable American engravers sponsored by the New York Public Library in 1928.  In 1970, art historian Cornelius Vermeule, in his volume on U.S. coins, viewed Longacre and his works less favorably, "uniform in their dullness, lack of inspiration, and even quaintness, Longacre's contributions to patterns and regular coinage were a decided step backwards from the art of [Thomas] Sully, [Titian] Peale, [Robert] Hughes, and Gobrecht" and "whatever his previous qualities as an engraver of portraits, he seems not to have brought much imagination to his important post at the Philadelphia Mint."  However, Vermeule considered the Flying Eagle cent more of a work of art, far above the mundane.In his 1991 article, McKenzie notes Vermeule's concerns, but considers Longacre's work important for its use of American symbols, including the representations of Native Americans.  He believes Longacre's use of such symbols influenced later coin designers, such as George T. Morgan, Victor D. Brenner, and Augustus Saint-Gaudens.  He particularly praises the ornate scroll on the reverse of the double eagle, calling it "unique in American numismatic art and enhances the elegance of a design befitting the highest-denomination U.S. coin", and applauds "the exciting innovation in symbolism and expression of national sentiment that he brought to U.S. numismatic art".According to Bowers, "Today, Longacre is widely admired by numismatists."  Lange notes that Longacre's "artistic vision graced 60 years of American coins".  Snow writes,
In view of the admiration that Saint-Gaudens, Vermeule, and others had for Longacre's "recycled" design borrowed from Gobrecht, and the enthusiasm collectors have for Flying Eagle cents today, perhaps it is all for the best that some other motif was not created in the 1850s at the Mint when experiments to eliminate the cumbersome large copper cent were conducted.

Ex Output:
What is the full name of the person that said "he seems not to have brought much imagination to his important post at the Philadelphia Mint.""?