updated from Atlas repo

iterables/sentence_gen.py

@@ -12,12 +12,14 @@ class Sentence:
 
     def __init__(self, text):
         self.text = text
+        self.words = RE_WORD.findall(text)
 
     def __repr__(self):
         return 'Sentence(%s)' % reprlib.repr(self.text)
 
     def __iter__(self):
-        for match in RE_WORD.finditer(self.text):  # <1>
-            yield match.group()  # <2>
+        for word in self.words:  # <1>
+            yield word  # <2>
+        return  # <3>
 
-# done! <3>
+# done! <4>