tracks/scala/config.json in trackler-2.0.5.11 vs tracks/scala/config.json in trackler-2.0.5.12

@@ -410,27 +410,40 @@
 		},
     {
       "slug": "parallel-letter-frequency",
       "difficulty": 1,
       "topics": [
+        "Maps",
+        "Sequences",
+        "Strings",
+        "Parallellism",
+        "Transforming",
+        "Dictionaries"
       ]
 		},
     {
       "slug": "sgf-parsing",
       "difficulty": 1,
       "topics": [
+        "Parsing",
+        "Transforming"
       ]
 		},
     {
       "slug": "acronym",
       "difficulty": 1,
       "topics": [
+        "Strings",
+        "Transforming"
       ]
 		},
     {
       "slug": "zipper",
       "difficulty": 1,
       "topics": [
+         "Generics",
+         "Optional values",
+         "Trees"
       ]
 		},
     {
       "slug": "forth",
       "difficulty": 1,