In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

Passage: Dark Heresy is considered a progressive death metal band. Dark Heresy's 1993 demo Diabolus in Musica was praised for amalgamating "well-chosen sprinklings of classic Morbid Angel with a UK death [metal] flair", and for mixing thrash "with classy chunks of unapologetic metal." Although dismissed by rock music magazine Kerrang! as "a widdly Carcass", their 1995 album Abstract Principles Taken to Their Logical Extremes was praised by extreme music magazine Terrorizer, who wrote that "Dark Heresy's music is not about mind-numbing brutality and dazzling speed, but is about complex and reflective musical structures supporting complex ideas ... while the vocals swing from gruff grunts to choral chants", and described Diabolus In Musica as "one of the most inventive works from an occultist band." Writing in Isten magazine in 1996, Endre Begby described Dark Heresy as "speak[ing] a tonal language very uncommon in death metal" and "break[ing] out of the fifth and major/minor third patterns." He similarly compared part of Abstract Principles Taken to Their Logical Extremes to Morbid Angel's 1989 debut album Altars of Madness, while noting that other parts are "totally flipped out, finding no comparison in modern metal", and summing up that Dark Heresy "fuck with the very foundation of death metal as we know it". Heavy metal and hard rock website Worshipmetal.com agreed with these assessments when revisiting Abstract Principles Taken to Their Logical Extremes in 2017, noting the complex compositions, and adding that Dark Heresy "seemed to throw every single idea into the mix, culminating in a bewildering experience that managed to be both beautiful and brutal in the same breath", and finding similarities between Dark Heresy's music and that of Carcass, Pestilence, and the Mahavishnu Orchestra, and describing their approach to songwriting as "difficult to pin down but ... utterly unique nonetheless."
 Link Information: Terrorizer published its first issue in October 1993 Question: How many years after Terrorizer was founded did it praise Dark Heresy's 1995 album?
Answer: 2

Passage: The Abana was sailing from Liverpool to Savannah, Georgia when she was caught in a storm in the Irish Sea. She was spotted at 3 pm drifting in a northwesterly direction with her sails torn to shreds. The crew mistook Blackpool Tower for a lighthouse and the ship was first spotted foundering at North Pier, and ended up drifting north and was wrecked off Little Bispham at 5 pm. Flares were fired and the lifeboat was called out. The alarm was raised by the landlord of the Cleveleys Hotel. Due to the weather conditions, the Blackpool lifeboat Samuel Fletcher had to be taken some overland to Bispham before it could be launched. The lifeboat had a crew of 16, and the Abana had a crew of 17, all of whom were taken on board along with the ship's dog, which belonged to Captain Danielson. The lifeboat grounded on a sandbank whilst returning to shore, but some of the crew members pushed the boat afloat and they managed to reach shore safely. All were taken to the Red Lion Inn to recover from their ordeal. The ship's bell and dog were given to the landlord of the Cleveleys Hotel, who had raised the alarm.
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Two Lancashire architects, James Maxwell and Charles Tuke, designed the tower and oversaw the laying of its foundation stone on 29 September 1891 Question: When was the structure the crew of the Abana mistook for a lighthouse constructed?
Answer: 1891

Passage: The First Indochina War had raged, as guerrilla warfare, since 19 December 1946. From 1949, it evolved into conventional warfare, due largely to aid from the communists of the People's Republic of China ("PRC") to the north. Subsequently, the French strategy of occupying small, poorly defended outposts throughout Indochina, particularly along the Vietnamese-Chinese border, started failing. Thanks to the terrain, popular support for August Revolution and support for decolonization from bordering China and the U.S.S.R., the Viet Minh had succeeded in turning a "clandestine guerrilla movement into a powerful conventional army", following asymmetric warfare theory laid by Mao Tse Tung, something which previously had never been encountered by the western colonial powers. In October 1952, fighting around the Red River Delta spread into the Thai Highlands, resulting in the Battle of Nà Sản, at which the Viet Minh were defeated. The French used the lessons learned at Nà Sản – strong ground bases, versatile air support, and a model based on the British Burma Campaign – as the basis for their new strategy. The Viet Minh, however, remained unbeatable in the highland regions of Vietnam, and the French "could not offset the fundamental disadvantages of a roadbound army facing a hill and forest army in a country which had few roads but a great many hills and forests".
 Link Information: On 23 November at 20:00 Việt Minh forces from the 88/308 twice attacked at P.A. 8 and were twice pushed back by the entrenched Franco-Vietnamese troops.

From 24 to 30 November Việt Minh forces made night attacks Question: How long did the battle around the Red River Delta where colonial French forces defeated the Viet Minh last?

Answer: 10