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The follow is a list of commands which can be used in a document to modify the behavior of a class. These commands can be used regardless of which class the document uses. See the page on Document Classes for more information about classes in LaTeX2e.
\flushbottom
\flushbottom declaration makes all text pages the same height,
adding extra vertical space when necessary to fill out the page.
This is the standard if twocolumn mode is selected.
\onecolumn
\onecolumn declaration starts a new page and produces
single-column output.
\raggedbottom
\raggedbottom declaration makes all pages the height of the text
on that page. No extra vertical space is added.
\twocolumn
\twocolumn declaration starts a new page and produces two-column
output.