In this task, you're expected to write answers to questions involving multiple references to the same entity. The answer to the question should be unambiguous and a phrase in the paragraph. Most questions can have only one correct answer.

Example Input: Passage: Sometime after 4 p.m. on December 6, 1989, Marc Lépine arrived at the building housing the École Polytechnique, an engineering school affiliated with the Université de Montréal, armed with a semi-automatic rifle and a hunting knife. Lépine purchased a rifle on November 21, 1989, in a Checkmate Sports store in Montreal. He had told the clerk that he was going to use it to hunt small game. Lépine had been in and around the École Polytechnique building at least seven times in the weeks leading up to December 6.
Lépine first sat in the office of the registrar on the second floor for a while. While there, he was seen rummaging through a plastic bag. He did not speak to anyone, even when a staff member asked if she could help him. Lépine left the office and was subsequently seen in other parts of the building before entering a second-floor mechanical engineering class of about sixty students at about 5:10 p.m. After approaching the student giving a presentation, he asked everyone to stop everything and ordered the women and men to opposite sides of the classroom. No one moved at first, believing it to be a joke until he fired a shot into the ceiling.Lépine then separated the nine women from the approximately fifty men and ordered the men to leave. He asked the remaining women whether they knew why they were there, and when one student replied "no," he answered: "I am fighting feminism." One of the students, Nathalie Provost, said, "Look, we are just women studying engineering, not necessarily feminists ready to march on the streets to shout we are against men, just students intent on leading a normal life." Lépine responded, "You're women, you're going to be engineers. You're all a bunch of feminists. I hate feminists." He then opened fire on the students from left to right, killing six, and wounding three others, including Provost.  Before leaving the room, he wrote the word shit twice on a student project.Lépine continued into the second-floor corridor and wounded three students before entering another room where he twice attempted to shoot a female student. When his weapon failed to fire, he entered the emergency staircase where he was seen reloading his gun. He returned to the room he had just left, but the students had locked the door; Lépine failed to unlock it with three shots fired into the door. Moving along the corridor, he shot at others, wounding one, before moving towards the financial services office where he shot and killed a woman through the window of the door she had just locked. 
Question: What is the first name of the person who sat in the office of the registrar on the second floor for a while?
Example Output: Marc.

Example Input: Passage: Altar 1 is found at the base of Stela 1. It is rectangular in shape with carved molding on its side.Altar 2 is of unknown provenance, having been moved to outside the administrator's house on the San Isidro Piedra Parada plantation. It is 1.59 metres (63 in) long, about 0.9 metres (35 in) wide and about 0.5 metres (20 in) high. It represents an animal variously identified as a toad and a jaguar. The body of the animal was sculptured to form a hollow 85 centimetres (33 in) across and 26 centimetres (10 in) deep. The sculpture was broken into three pieces.Altar 3 is a roughly worked flat, circular altar about 1 metre (39 in) across and 0.3 metres (12 in) high. It was probably associated originally with a stela but its original location is unknown, it was moved near to the manager's house on the San Isidro Piedra Parada plantation.Altar 5 is a damaged plain circular altar associated with Stela 2.Altar 7 is near the southern edge of the plaza on Terrace 3, where it is one of five monuments in a line running east-west.Altar 8 is a plain monument associated with Stela 5, positioned on the west side of Structure 12.Altar 9 is a low four-legged throne placed in front of Structure 11.Altar 10 was associated with Stela 13 and was found on top of the large offering of ceramics associated with that stela and the royal tomb in Structure 7A. The monument was originally a throne with cylindrical supports that was reused as an altar in the Classic period.Altar 12 is carved in the early Maya style and archaeologists consider it to be an especially early example dating to the first part of the Late Preclassic. Because of the carvings on the upper face of the altar, it is supposed that the monument was originally erected as a vertical stela in the Late Preclassic, and was reused as a horizontal altar in the Classic. At this time 16 hieroglyphs were carved around the outer rim of the altar. The carving on the upper face of the altar represents a standing human figure portrayed in profile, facing left. The figure is flanked by two vertical series of four glyphs. A smaller profile figure is depicted facing the first figure, separated from it by one of the series of glyphs. The central figure is depicted standing upon a horizontal band representing the earth, the band is flanked by two earth monsters. Above the figure is a celestial band with part of the head of a sacred bird visible in the centre. The 16 glyphs on the rim of the monument are formed by anthropomorphic figures mixed with other elements. 
Question: What is carved on the outer rim of Altar 12 and are formed by anthropomorphic figures mixed with other elements?
Example Output: 16 hieroglyphs.

Example Input: Passage: Piper reported that as he was leaving Exchange Buildings to return to Houndsditch he saw a man acting suspiciously in the shadows of the cul-de-sac. As the policeman approached him, the man walked away; Piper later described him as being approximately 5 feet 7 inches (1.70 m), pale and fair-haired. When Piper reached Houndsditch he saw two policemen from the adjoining beats—constables Woodhams and Choate—who watched 120 Houndsditch and 11 Exchange Buildings while Piper went to the nearby Bishopsgate Police Station to report. By 11:30 seven uniformed and two plain clothes policemen had gathered in the locality, each armed with his wooden truncheon. Sergeant Bentley from Bishopsgate police station knocked at number 11, unaware that Piper had already done so, which alerted the gang. The door was answered by Gardstein, who made no response when Bentley asked if anyone was working there. Bentley asked him to fetch someone who spoke English; Gardstein left the door half-closed and disappeared inside. Bentley entered the hall with Sergeant Bryant and Constable Woodhams; as they could see the bottom of his trouser legs, they soon realised that someone was watching them from the stairs. The police asked the man if they could step into the back of the property, and he agreed. As Bentley moved forward, the back door opened and one of the gang exited, firing from a pistol as he did so; the man on the stairs also began firing. Bentley was shot in the shoulder and the neck—the second round severing his spine. Bryant was shot in the arm and chest and Woodhams was wounded in the leg, which broke his femur; both collapsed. Although they survived, neither Bryant or Woodhams fully recovered from their injuries.As the gang exited the property and made to escape up the cul-de-sac, other police intervened. Sergeant Charles Tucker from Bishopsgate police station was hit twice, once in the hip and once in the heart by Peters: he died instantly. Choate grabbed Gardstein and wrestled for his gun, but the Russian managed to shoot him in the leg. Other members of the gang ran to Gardstein's assistance, shooting Choate twelve times in the process, but Gardstein was also wounded; as the policeman collapsed, Gardstein was carried away by his accomplices, who included Peters. As these men, aided by an unknown woman, made their escape with Gardstein they were accosted by Isaac Levy, a passer-by, whom they threatened at pistol-point. He was the only witness to the escape who was able to provide firm details; other witnesses confirmed they saw a group of three men and a woman, and thought one of the men was drunk as he was being helped by his friends. The group, which included Peters, went to Svaars' and Peter the Painter's lodgings at 59 Grove Street (now Golding Street), off Commercial Road, where Gardstein was tended by two of the gang's associates, Luba Milstein (Svaars' mistress) and Sara Trassjonsky. As they left Gardstein on the bed, Peters left his Dreyse pistol under the mattress, either to make it seem the wounded man was the one who had killed Tucker, or to enable him to defend himself against a possible arrest. 
Question: What were the last names of the two gang associates who tended to Gardstein?
Example Output:
Milstein.