You can set any size for a sidebar (read more about sizes). Sidebars can be specified, for the whole site, for each category or page type, or individually for each page / post. You can create as many sidebar as you wish. There are 6 different layouts to use:
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Right sidebar
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Left sidebar
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2 sidebars
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2 right sidebars
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2 left sidebars
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No sidebars
