input: Please answer the following: Extract the answer to the question from the following context. Question: What structural elements allow a climbing elevator to move? Context: A climbing elevator is a self-ascending elevator with its own propulsion. The propulsion can be done by an electric or a combustion engine. Climbing elevators are used in guyed masts or towers, in order to make easy access to parts of these constructions, such as flight safety lamps for maintenance. An example would be the Moonlight towers in Austin, Texas, where the elevator holds only one person and equipment for maintenance. The Glasgow Tower an observation tower in Glasgow, Scotland also makes use of two climbing elevators.
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output: an electric or a combustion engine

input: Please answer the following: Extract the answer to the question from the following context. Question: What is Seed7? Context: In UTF-32 and UCS-4, one 32-bit code value serves as a fairly direct representation of any character's code point (although the endianness, which varies across different platforms, affects how the code value manifests as an octet sequence). In the other encodings, each code point may be represented by a variable number of code values. UTF-32 is widely used as an internal representation of text in programs (as opposed to stored or transmitted text), since every Unix operating system that uses the gcc compilers to generate software uses it as the standard "wide character" encoding. Some programming languages, such as Seed7, use UTF-32 as internal representation for strings and characters. Recent versions of the Python programming language (beginning with 2.2) may also be configured to use UTF-32 as the representation for Unicode strings, effectively disseminating such encoding in high-level coded software.
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output: programming languages

input: Please answer the following: Extract the answer to the question from the following context. Question: Who provided Athanasius with information? Context: Constantius, renewing his previous policies favoring the Arians, banished Athanasius from Alexandria once again. This was followed, in 356, by an attempt to arrest Athanasius during a vigil service. Athanasius fled to Upper Egypt, where he stayed in several monasteries and other houses. During this period, Athanasius completed his work Four Orations against the Arians and defended his own recent conduct in the Apology to Constantius and Apology for His Flight. Constantius's persistence in his opposition to Athanasius, combined with reports Athanasius received about the persecution of non-Arians by the new Arian bishop George of Laodicea, prompted Athanasius to write his more emotional History of the Arians, in which he described Constantius as a precursor of the Antichrist.
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output: George of Laodicea

input: Please answer the following: Extract the answer to the question from the following context. Question: What did they use to defend key cities? Context: Yet controlling the "Mandate of Heaven" was a daunting task. The vastness of China's territory meant that there were only enough banner troops to garrison key cities forming the backbone of a defense network that relied heavily on surrendered Ming soldiers. In addition, three surrendered Ming generals were singled out for their contributions to the establishment of the Qing dynasty, ennobled as feudal princes (), and given governorships over vast territories in Southern China. The chief of these was Wu Sangui, who was given the provinces of Yunnan and Guizhou, while generals Shang Kexi and Geng Jingzhong were given Guangdong and Fujian provinces respectively.
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output:
surrendered Ming soldiers