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Define Architiype

Define Walkers

Describe their interaction and roles


\section{Walkers and Graphs as First Order Citizens}\index{walkers in Jac}\index{graphs in Jac}\input{tex/sec/sec-jacwalkers}
\section{Architypes and Actions}\index{architypes in Jac}\index{actions in Jac}\input{tex/sec/sec-jacarch}