Architecture is the art which makes buildings beautiful to look at as well as useful. A man who designs buildings and makes the plans for them is called an architect. He has to think not only of what he wants the building to look like when it is finished, but also what it is to be used for. He must not forget the sort of material to be used in the building. This may be stone, brick, wood or steel and concrete.
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The sort of material to be used in the building may not be stone, brick, wood or steel and concrete.
The sort of material to be used in the building must be brick.
The sort of material to be used in the building may be stone or wood.
Steel or concrete may be used in the building as a sort of material.