\frametitle{Various Collection Ops}\pause E.g. {\bf addlists()}. \pause Say have distributed list, 2 compoments. From one, manager node receives \begin{lstlisting} list(a=3,b=8) \end{lstlisting} and from the other \begin{lstlisting} list(a=5,b=1,c=12) \end{lstlisting} The functions ``adds'' them, producing (non-distributed) \begin{lstlisting} list(a=8,b=9,c=12) \end{lstlisting}