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In page Fazlur Rahman Khan:
"The tubular systems have yet to reach their limit when it comes to height.[10] Another important feature of the tubular systems is that buildings can be constructed using steel or reinforced concrete, or a composite of the two, to reach greater heights. Khan pioneered the use of lightweight concrete for high-rise buildings,[11] at a time when reinforced concrete was used for mostly low-rise construction of only a few stories in height.[12] Most of Khan's designs were conceived considering pre-fabrication and repetition of components so projects could be quickly built with minimal errors.[13]
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