user: Problem: Incandescent light bulb:

Lewis Latimer, employed at the time by Edison, developed an improved method of heat-treating carbon filaments which reduced breakage and allowed them to be molded into novel shapes, such as the characteristic "M" shape of Maxim filaments. On 17 January 1882, Latimer received a patent for the "Process of Manufacturing Carbons", an improved method for the production of light bulb filaments, which was purchased by the United States Electric Light Company. Latimer patented other improvements such as a better way of attaching filaments to their wire supports.

Which company purchased Latimer's patent?
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A: United States Electric Light Company

Problem: All the objects from everyday life that we can bump into, touch or squeeze are composed of atoms. This atomic matter is in turn made up of interacting subatomic particles—usually a nucleus of protons and neutrons, and a cloud of orbiting electrons. Typically, science considers these composite particles matter because they have both rest mass and volume. By contrast, massless particles, such as photons, are not considered matter, because they have neither rest mass nor volume. However, not all particles with rest mass have a classical volume, since fundamental particles such as quarks and leptons (sometimes equated with matter) are considered "point particles" with no effective size or volume. Nevertheless, quarks and leptons together make up "ordinary matter", and their interactions contribute to the effective volume of the composite particles that make up ordinary matter.
What cannot contribute to effective volume?
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Answer: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
However, during this period, major figures and artists in the scene began leaning away from underground aesthetics. In the music press, the increasingly esoteric writing of post-punk publications soon began to alienate their readerships; it is estimated that within several years, NME suffered the loss of half its circulation. Writers like Paul Morley began advocating "overground brightness" instead of the experimental sensibilities promoted in early years. Morley's own musical collaboration with engineer Gary Langan and programmer J. J. Jeczalik, the Art of Noise, would attempt to bring sampled and electronic sounds to the pop mainstream. A variety of more pop-oriented groups, including ABC, the Associates, Adam and the Ants and Bow Wow Wow (the latter two managed by former Sex Pistols manager Malcolm McLaren) emerged in tandem with the development of the New Romantic subcultural scene. Emphasizing glamour, fashion, and escapism in distinction to the experimental seriousness of earlier post-punk groups, the club-oriented scene drew some suspicion from denizens of the movement.
What did authors and artists begin advocating for instead of the underground scene?
A: overground brightness

Context and question: In his native Poland, in France, where he composed most of his works, and beyond, Chopin's music, his status as one of music's earliest superstars, his association (if only indirect) with political insurrection, his love life and his early death have made him, in the public consciousness, a leading symbol of the Romantic era. His works remain popular, and he has been the subject of numerous films and biographies of varying degrees of historical accuracy.
In which era was Frédéric leave a legacy of as a leading symbol?
Answer: Romantic era

Question: The company is often criticized by both the media and its own staff for its less upstanding policies regarding employee relations. A 2012 Reddit post written by an anonymous Comcast call center employee eager to share their negative experiences with the public received attention from publications including The Huffington Post. A 2014 investigative series published by The Verge involved interviews with 150 of Comcast's employees. It sought to examine why the company has become so widely criticized by its customers, the media and even members of its own staff. The series claimed part of the problem is internal and that Comcast's staff endures unreasonable corporate policies. According to the report: "customer service has been replaced by an obsession with sales; technicians are understaffed while tech support is poorly trained; and the company is hobbled by internal fragmentation." A widely read article penned by an anonymous call center employee working for Comcast appeared in November 2014 on Cracked. Titled "Five Nightmares You Live While Working For America's Worst Company," the article also claimed that Comcast is obsessed with sales, doesn't train its employees properly and concluded that "the system makes good customer service impossible."
Is there an answer to this question: What was the name of The Verge's investigative series?

Answer: unanswerable

Problem: Guinea-Bissau:

Guinea-Bissau was once part of the kingdom of Gabu, as well as part of the Mali Empire. Parts of this kingdom persisted until the 18th century, while a few others were under some rule by the Portuguese Empire since the 16th century. In the 19th century, it was colonized as Portuguese Guinea. Upon independence, declared in 1973 and recognised in 1974, the name of its capital, Bissau, was added to the country's name to prevent confusion with Guinea (formerly French Guinea). Guinea-Bissau has a history of political instability since independence, and no elected president has successfully served a full five-year term.

What empire was Guinea-Bissau once part of?
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A:

assistant: Mali Empire