Unique characters: Difference between revisions

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@@ Line 797: / Line 797: @@
 # uniques :: [String] -> [Char]
-def uniques(ks):
+def uniques(xs):
     '''Characters which occur only once
-       across the given strings.
+       across the list of given strings.
     '''
     return [
         k for k, g in
-        groupby(sorted(chain(*ks)))
+        groupby(sorted(chain(*xs)))
         if 1 == len(list(g))
     ]