File:ADT unfold - upFrom.png

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\begin{diagram}
\N                                     & \rDashto^{\tt upFrom} & {\tt Stream}_\N \\
\dTo^{\langle 1_\N, {\tt succ}\rangle} &                       & \dTo_{\langle{\tt head}, {\tt tail}\rangle} \\
\N \times \N                           & \rTo                  & \N \times {\tt Stream}_\N
\end{diagram}