instruction:
This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.
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Mahayana Buddhism received significant theoretical grounding from Nagarjuna (perhaps c. 150250 CE), arguably the most influential scholar within the Mahayana tradition. Nagarjuna's primary contribution to Buddhist philosophy was the systematic exposition of the concept of sunyata, or "emptiness", widely attested in the Prajnaparamita sutras that emerged in his era. The concept of emptiness brings together other key Buddhist doctrines, particularly anatta and dependent origination, to refute the metaphysics of Sarvastivada and Sautrantika (extinct non-Mahayana schools). For Nagarjuna, it is not merely sentient beings that are empty of atman; all phenomena (dharmas) are without any svabhava (literally "own-nature" or "self-nature"), and thus without any underlying essence; they are "empty" of being independent; thus the heterodox theories of svabhava circulating at the time were refuted on the basis of the doctrines of early Buddhism. Nagarjuna's school of thought is known as the Madhyamaka. Some of the writings attributed to Nagarjuna made explicit references to Mahayana texts, but his philosophy was argued within the parameters set out by the agamas. He may have arrived at his positions from a desire to achieve a consistent exegesis of the Buddha's doctrine as recorded in the Canon. In the eyes of Nagarjuna the Buddha was not merely a forerunner, but the very founder of the Madhyamaka system.
answer:
Nagarjuna's main contribution was the exposition of the concept of what?

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Airports may also contain premium and VIP services. The premium and VIP services may include express check-in and dedicated check-in counters. These services are usually reserved for First and Business class passengers, premium frequent flyers, and members of the airline's clubs. Premium services may sometimes be open to passengers who are members of a different airline's frequent flyer program. This can sometimes be part of a reciprocal deal, as when multiple airlines are part of the same alliance, or as a ploy to attract premium customers away from rival airlines.
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What are some services that are offered by VIP services?

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Interracial relationships, common-law marriages, and marriages occurred since the earliest colonial years, especially before slavery hardened as a racial caste associated with people of African descent in the British colonies. Virginia and other English colonies passed laws in the 17th century that gave children the social status of their mother, according to the principle of partus sequitur ventrem, regardless of the father's race or citizenship. This overturned the principle in English common law by which a man gave his status to his children this had enabled communities to demand that fathers support their children, whether legitimate or not. The change increased white men's ability to use slave women sexually, as they had no responsibility for the children. As master as well as father of mixed-race children born into slavery, the men could use these people as servants or laborers or sell them as slaves. In some cases, white fathers provided for their multiracial children, paying or arranging for education or apprenticeships and freeing them, particularly during the two decades following the American Revolution. (The practice of providing for the children was more common in French and Spanish colonies, where a class of free people of color developed who became educated and property owners.) Many other white fathers abandoned the mixed-race children and their mothers to slavery.
answer:
What did the laws passed in the 17th century do?