I am done

rl/Lib/site-packages/sympy/strategies/branch/tools.py

@@ -0,0 +1,12 @@
+from .core import exhaust, multiplex
+from .traverse import top_down
+
+
+def canon(*rules):
+    """ Strategy for canonicalization
+
+    Apply each branching rule in a top-down fashion through the tree.
+    Multiplex through all branching rule traversals
+    Keep doing this until there is no change.
+    """
+    return exhaust(multiplex(*map(top_down, rules)))