Question: Extract the answer to the question from the following context. Question: A music piece intended to be played with only vocal singers, and is not accompanied with any musical instrument is? Context: The Swingle Singers used nonsense words to sound like instruments, but have been known to produce non-verbal versions of musical instruments. Like the other groups, examples of their music can be found on YouTube. Beatboxing, more accurately known as vocal percussion, is a technique used in a cappella music popularized by the hip-hop community, where rap is often performed a cappella also. The advent of vocal percussion added new dimensions to the a cappella genre and has become very prevalent in modern arrangements. Petra Haden used a four-track recorder to produce an a cappella version of The Who Sell Out including the instruments and fake advertisements on her album Petra Haden Sings: The Who Sell Out in 2005. Haden has also released a cappella versions of Journey's "Don't Stop Believin'", The Beach Boys' "God Only Knows" and Michael Jackson's "Thriller". In 2009, Toyota commissioned Haden to perform three songs for television commercials for the third-generation Toyota Prius, including an a cappella version of The Bellamy Brothers' 1970s song "Let Your Love Flow".[citation needed]
Answer: a cappella
[Q]: Extract the answer to the question from the following context. Question: What makes Reverse Resistance different, especially local? Context: In music, popular local bands include The Five Stars, Penina o Tiafau and Punialava'a. The Yandall Sisters' cover of the song Sweet Inspiration reached number one on the New Zealand charts in 1974. King Kapisi was the first hip hop artist to receive the prestigious New Zealand APRA Silver Scroll Award in 1999 for his song Reverse Resistance. The music video for Reverse Resistance was filmed in Savai'i at his villages. Other successful Samoan hip hop artists include rapper Scribe, Dei Hamo, Savage and Tha Feelstyle whose music video Suamalie was filmed in Samoa.
****
[A]: filmed in Savai'i at his villages
input: Please answer the following: Extract the answer to the question from the following context. Question: Who was the manager for Everton first, Royle or Walker? Context: Everton were founder members of the Premier League in 1992, but struggled to find the right manager. Howard Kendall had returned in 1990 but could not repeat his previous success, while his successor, Mike Walker, was statistically the least successful Everton manager to date. When former Everton player Joe Royle took over in 1994 the club's form started to improve; his first game in charge was a 20 victory over derby rivals Liverpool. Royle dragged Everton clear of relegation, leading the club to the FA Cup for the fifth time in its history, defeating Manchester United 10 in the final.
++++++++++
output: Walker
Please answer this: Extract the answer to the question from the following context. Question: What is eliminated by compression algorithms? Context: Video data may be represented as a series of still image frames. The sequence of frames contains spatial and temporal redundancy that video compression algorithms attempt to eliminate or code in a smaller size. Similarities can be encoded by only storing differences between frames, or by using perceptual features of human vision. For example, small differences in color are more difficult to perceive than are changes in brightness. Compression algorithms can average a color across these similar areas to reduce space, in a manner similar to those used in JPEG image compression. Some of these methods are inherently lossy while others may preserve all relevant information from the original, uncompressed video.
++++++++
Answer: spatial and temporal redundancy
Problem: Extract the answer to the question from the following context. Question: What required slaves to serve as an apprentice before being fully free? Context: With support from the British abolitionist movement, Parliament enacted the Slave Trade Act in 1807, which abolished the slave trade in the empire. In 1808, Sierra Leone was designated an official British colony for freed slaves. The Slavery Abolition Act passed in 1833 abolished slavery in the British Empire on 1 August 1834 (with the exception of St. Helena, Ceylon and the territories administered by the East India Company, though these exclusions were later repealed). Under the Act, slaves were granted full emancipation after a period of 4 to 6 years of "apprenticeship".

A: The Slavery Abolition Act
input: Please answer the following: Extract the answer to the question from the following context. Question: What does wood strength depend on? Context: Different pieces of wood cut from a large tree may differ decidedly, particularly if the tree is big and mature. In some trees, the wood laid on late in the life of a tree is softer, lighter, weaker, and more even-textured than that produced earlier, but in other trees, the reverse applies. This may or may not correspond to heartwood and sapwood. In a large log the sapwood, because of the time in the life of the tree when it was grown, may be inferior in hardness, strength, and toughness to equally sound heartwood from the same log. In a smaller tree, the reverse may be true.
++++++++++
output:
time