diff --git a/Fusion.ruel b/Fusion.ruel
index 6b47e5a..34d31e2 100644
--- a/Fusion.ruel
+++ b/Fusion.ruel
@@ -29,7 +29,6 @@ anyNTAAHead = (NTAAHead0, NTAAHead1)
 anyhead = (StrongHead, WeakHead, anyNTAAHead)
 anyWW = (anyhead, WeakWire, StrongWire)
 anyNTAA = (anyNTAAHead, NTAATail, NTAAWire)
-anyNTAAHead = (NTAAHead0, NTAAHead1)
 
 # --------------DECA---------------
 
diff --git a/build_new_rules.py b/build_new_rules.py
index 0bc6ba5..02e8e40 100644
--- a/build_new_rules.py
+++ b/build_new_rules.py
@@ -7,10 +7,11 @@
 for file in files:
     rulename = file.rstrip('.ruel')
     exitcode = os.system(f'python3 -m nutshell transpile {file} .')
+    exitcode += os.system(f'mv {rulename}.rule "Rule:{rulename}"')
     if exitcode > 0:
         sys.exit(exitcode)
-    os.system(f'mv {rulename}.rule "Rule:{rulename}"')
-    
+
+sys.exit(0)
 # permanent fix for supposedly/nutshell#20
 with open('Rule:Fusion') as f: badtext = f.read()
 bef, af = badtext.split('var any.0')