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\section{Conclusion} \label{sec:conclusion}  \textbf{[We \begin{itemize}  \item What answers  haveoffered \ldots The limitations are \ldots]}  In his treatise on logic and scientific method, W. Stanley Jevons  wrote:  \begin{quote}  ``\emph{sufficient investigation would probably show that almost every  branch of art and science had an accidental beginning} \ldots  \emph{With the progress of any branch of science, the element of  chance becomes much reduced}'' \cite[p. 531]{jevons:1877}  \end{quote}  We are still in early days for intelligent machines, where serendipity  may play a significant role in fundamental aspects of both theory and  practise. However,  we foresee serendipity playing a continued and indeed  central role within intelligent systems, for which there is always  something new to learn. offered?  \item Further questions  \end{itemize}