Explicitly show how to iterate over the data in the comment.

11-find_duplicates/cpp/find_duplicates.h

@@ -5,8 +5,12 @@ vector<string> find_duplicates(DataGenerator& generator) {
      * Find duplicates in the given data.
      *
      * The `generator` provides a forward iterator over strings
-     * for traversing the data (so it can be iterated for example
-     * using a `for` cycle). It can be traversed multiple times.
+     * for traversing the data, so it can be iterated for example
+     * using a `for` cycle:
+     *
+     *   for (const string& item : generator) {...}
+     *
+     * The `generator` can be traversed multiple times.
      *
      * The goal is to return a vector of duplicated entries,
      * reporting each duplicated entry only once, in the order

11-find_duplicates/python/find_duplicates.py

@@ -4,9 +4,12 @@ import sys
 def find_duplicates(data_generator):
     """Find duplicates in the given data.
 
-    The data_generator is an `iterable` (it can be iterated over in a for cycle,
-    or passed to `iter` method to explicitly generate an iterator) returning
-    strings. It can be iterated multiple times.
+    The `data_generator` is an iterable over strings, so it can be
+    iterated for example using a `for` cycle:
+
+      for item in data_generator: ...
+
+    It can be iterated multiple times.
 
     The goal is to return a list of duplicated entries, reporting each duplicated
     entry only once, in the order of their first occurrence in the data.