--- a/model.tex
+++ b/model.tex
@@ -21,13 +21,13 @@
       \node[rev,join] {};
       \node[rev,join] {};
       \node[rev,join] (x) {};
-      \node[rev,join, above right=of x] (y) {};
+      \node[rev,join=by join-nw, above right=of x] (y) {};
       \node[rev,join] (a) {};
-      \node[rev,join=with x, below right=of x] (z) {};
+      \node[rev,join=with x by join-sw, below right=of x] (z) {};
       \node[rev,join] {};
       \node[rev,join] {};
       \node[rev,join] (w) {};
-      \node[rev,join, above right=of w] (b) {};
+      \node[rev,join=by join-es, above right=of w] (b) {};
       \node[rev,join] {};
       \draw[->] (a) to[out=0, in=150] (b);
     \end{tikzpicture}