Correctly activate zuse jets.
:::::: :::::: volume 3, Arvo models and skeleton ::::::
:::::: ::::::::::::::::::::::::::::::::::::::::::::::::::::::
=>
-~% %arvo + ~
+~% %hex + ~
|%
++ arch {fil/(unit @uvI) dir/(map @ta $~)} :: fundamental node
++ arvo (wind {p/term q/mill} mill) :: arvo card
