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Wherever possible, recycled ( ) materials have been used.
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Large-scale construction requires collaboration ( ) across multiple disciplines.
In general, there are three sectors of construction: buildings, infrastructure ( ) and industrial.
As cities grew during the Bronze Age, a class of professional craftsmen( ), like bricklayers and carpenters , appeared.
Later diesel and electric powered vehicles such as cranes, excavators( ) and bulldozers.
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