Problem: Background: Andriana refers to both the noble class and a title of nobility in Madagascar. Historically, many Malagasy ethnic groups lived in highly stratified caste-based social orders in which the andriana were the highest strata. They were above the Hova (free commoner castes) and Andevo (slaves). The Andriana and the Hova were a part of Fotsy, while the Andevo were Mainty in local terminology.
Context: Austronesian people started settling in Madagascar between 200 to 500 CE. They arrived by boats and were from various southeast Asian groups. African slaves were brought to the island's coasts between the 13th and the 18th centuries. The Portuguese traders were the first Europeans to arrive in the 15th century, followed by other European powers.  This influx of diverse people led to various Malagasy sub-ethnicities in the mid-2nd millennium. The Merina were probably the early arrivals, though this is uncertain and other ethnic groups on Madagascar consider them relative newcomers to the island. The Merina people's culture likely mixed and merged with the Madagascar natives named Vazimba about whom little is known. According to the island's oral traditions, the "most Austronesian looking" Merina people reached the interior of the island in the 15th century and established their society there because of wars and migrant pressure at the coast. Merina people were settled in the central Madagascar, formed one of the three major kingdoms on the island by the 18th century - the other two being Swahili-Arab influenced Sakalava kingdom on the west-northwest and Austronesian Betsimisaraka kingdom on the east-northeast.  The term Hova originally applied to all members of the Merina people who arrived in the central highlands around the 15th century and absorbed the existing population of Vazimba. Andriamanelo (1540-1575) consolidated the power of the Hova when he united many of the Hova chiefdoms around Antananarivo under his rule. The term Hova remained in use through the 20th century, though some foreigners transliterated that word to be Ankova, and increasingly used since the 19th century.  In and after the 16th century, slaves were brought into Madagascar's various kingdoms, and social strata emerged in Merina kingdom. The Hova emerged as the free commoners caste below the nobles hierarchy. During the rule of King Andriamanelo, a subset of Hova related to the king by blood came under the title Andriana. The social structure of the new kingdom became further defined under his son Ralambo (1575-1612), who further subdivided the Andriana into four ranks, and eventually six sub-castes by King Andriamasinavalona (1675-1710).
Question: What did the Andriana do?
Answer: subdivided the Andriana into four ranks, and eventually six sub-castes by King Andriamasinavalona (1675-1710).

Problem: Background: De La Soul is an American hip hop trio formed in 1987 on Long Island, New York. The group is best known for their eclectic sampling, quirky lyrics, and their contributions to the evolution of the jazz rap and alternative hip hop subgenres. The members are Posdnuos, Trugoy the Dove and Maseo. The three formed the group in high school and caught the attention of producer Prince Paul with a demo tape of the song "Plug Tunin'".
Context: The group's third studio release, 1993's Buhloone Mindstate, saw the group evolve a new sound as they continued to grow stylistically and musically. There were several moments on the album which proved the band had matured. "I Be Blowin'" was a departure as the track was an instrumental featuring saxophone playing by Maceo Parker. The introspective "I Am I Be" showed De La Soul at their most self-referential to date with subject matter about Pos' daughter Ayana Monet as well as his grandmother. "Long Island Wildin'" was a collaboration with Japanese hip hop artists Kan Takagi (Major Force) and trio Scha Dara Parr (SDP). The album's first single, "Breakadawn", used a sample of Michael Jackson's "I Can't Help It" and Smokey Robinson's "Quiet Storm". De La Soul collaborated for the first time with Gang Starr's Guru on "Patti Dooke", female MC Shortie No Mas, a cousin of Posdnuos, was prominent on many tracks on the album, showcased particularly "In The Woods". The album ended with an old school Biz Markie collaboration called "Stone Age". Missing from vocal duties is Mase, whose voice can only be heard on "Area" in a break near the end of the track. Also rarely featured is his scratching which was heard often on previous albums, with only "In the Woods" showcasing his talent in that area. The album was a critical success, but it was the biggest commercial failure for the group at the time of its release. Many publications, such as Rolling Stone, have listed this album as one of the best hip hop albums of all time.  In 1994, 500 copies of a promotional EP called Clear Lake Audiotorium were released on clear vinyl and CD. The 6 track EP contained edited versions of tracks off of Buhloone Mindstate but also featured the tracks "Sh.Fe.MC's" (Shocking Female MC's) which was a collaboration with A Tribe Called Quest, and Stix & Stonz which featured old-school hip hop artists Grandmaster Caz, Tito of Fearless Four, Whipper Whip, LA Sunshine and Superstar. The EP was widely bootlegged afterwards.  Stakes Is High (1996) was the first album not produced by Prince Paul, with overall production credits given solely to the trio. Although it was met with poor sales, it has been critically lauded for its music, lyricism, and its overall message concerning the artistic decline rap music began to face in the mid-90s. The title track and first single, produced by J Dilla, was not a hit, but the album's second single, "Itzsoweezee (HOT)", with only Dave on vocals, did fare better due to its creative music video. The album spawned a third single "4 More", featuring Zhane which peaked at #52 in the UK. The album did provide a launching pad for future star rapper and actor Mos Def, who appeared on the track "Big Brother Beat". The album also featured collaborations with Common, Truth Enola, and the Jazzyfatnastees.
Question: What happened in the middle period?
Answer:
The group's third studio release, 1993's Buhloone Mindstate,