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\textbf{your text here}
or
{\bf your text here}
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To write text in italic use:
\emph{text}
To write text in bold use:
\textbf{text}
To underline text use:
\underline{text}
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To write text in italic use:
\textit{text}
To write text in bold use:
\textbf{text}
To underline text use:
\underline{text}
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Some of the \textbf{greatest}
discoveries in science
were made by accident.