A structure is described by views that each show part of the truth: plans from above, elevations from the side, sections cut through it, and details at larger scale. Reading a set means moving between them and checking that they agree.
No single view shows a structure completely. A plan hides heights; an elevation hides depth; a section shows only where it is cut. A drawing set is a set of views that, together, describe one thing, and reading it means moving between them.
On sheet 4 you can follow how the views relate:
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