The \linebreak command tells LaTeX to break the current line at the point of the command. With the optional argument, number, you can convert the \linebreak command from a demand to a request. The number must be a number from 0 to 4. The higher the number, the more insistent the request is.
The \linebreak command causes LaTeX to stretch the line so it extends to the right margin.
See also Line and Page Breaking
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