Add multilingual language and systems learning tracks

en/expanded-29-1/lesson-3/main.py

@@ -0,0 +1,6 @@
+results={}
+def complete(key):
+    if key not in results:results[key]=len(results)+1
+    return results[key]
+print(complete("lesson-1"),complete("lesson-1"))
+print(len(results))