Problem: Extract the answer to the question from the following context. Question: What event happened four years before the Battle of the Zab in 750? Context: Around 746, Abu Muslim assumed leadership of the Hashimiyya in Khurasan. In 747, he successfully initiated an open revolt against Umayyad rule, which was carried out under the sign of the black flag. He soon established control of Khurasan, expelling its Umayyad governor, Nasr ibn Sayyar, and dispatched an army westwards. Kufa fell to the Hashimiyya in 749, the last Umayyad stronghold in Iraq, Wasit, was placed under siege, and in November of the same year Abu al-Abbas was recognized as the new caliph in the mosque at Kufa.[citation needed] At this point Marwan mobilized his troops from Harran and advanced toward Iraq. In January 750 the two forces met in the Battle of the Zab, and the Umayyads were defeated. Damascus fell to the Abbasids in April, and in August, Marwan was killed in Egypt.

A: Abu Muslim assumed leadership of the Hashimiyya

Problem: Extract the answer to the question from the following context. Question: One battle started on the last day of August and ended nearly a month later - what was the battle that occurred after this one? Context: The principal battles of the stalemate include the Battle of Bloody Ridge (18 August15 September 1951), the Battle of the Punchbowl (31 August-21 September 1951), the Battle of Heartbreak Ridge (13 September15 October 1951), the Battle of Old Baldy (26 June4 August 1952), the Battle of White Horse (615 October 1952), the Battle of Triangle Hill (14 October25 November 1952), the Battle of Hill Eerie (21 March21 June 1952), the sieges of Outpost Harry (1018 June 1953), the Battle of the Hook (2829 May 1953), the Battle of Pork Chop Hill (23 March16 July 1953), and the Battle of Kumsong (1327 July 1953).

A: Heartbreak Ridge

Problem: Extract the answer to the question from the following context. Question: What does the passage make an important point about the main topic? Context: The written score, however, does not usually contain explicit instructions as to how to interpret the piece in terms of production or performance, apart from directions for dynamics, tempo and expression (to a certain extent). This is left to the discretion of the performers, who are guided by their personal experience and musical education, their knowledge of the work's idiom, their personal artistic tastes, and the accumulated body of historic performance practices.

A: does not usually contain explicit instructions

Problem: Extract the answer to the question from the following context. Question: Why are rodents known to consume their waste? Context: Other animals, such as rabbits and rodents, practise coprophagia behaviours - eating specialised faeces in order to re-digest food, especially in the case of roughage. Capybara, rabbits, hamsters and other related species do not have a complex digestive system as do, for example, ruminants. Instead they extract more nutrition from grass by giving their food a second pass through the gut. Soft faecal pellets of partially digested food are excreted and generally consumed immediately. They also produce normal droppings, which are not eaten.

A:
in order to re-digest food