--- esz.py-	2016-09-30 02:00:00.000000000 +0900
+++ esz.py	2016-09-30 03:00:00.000000000 +0900
@@ -76,8 +76,7 @@ def join_type(top, lst):
 		return [ to_len2(top) ] + lst
 	if i > 0:
 		return [ to_len2(top) ] + lst[:i] + join_type( None, lst[i:] )
-	top += [ lst[0][1] ]
-	return join_type( to_len2(top), lst[1:] )
+	return join_type( top + [ lst[0][1] ], lst[1:] )
 
 def tree_bra(lst, kdic, sta=None):
 	d = dict( zip( kdic.get('br_s'), kdic.get('br_e') ) )