tracks/fsharp/config.json in trackler-2.0.5.9 vs tracks/fsharp/config.json in trackler-2.0.5.10

@@ -64,17 +64,10 @@
         "Discriminated unions",
         "Floating-point numbers"
       ]
     },
     {
-      "slug": "bank-account",
-      "difficulty": 2,
-      "topics": [
-        "Optional values"
-      ]
-    },
-    {
       "slug": "grains",
       "difficulty": 2,
       "topics": [
         "Integers"
       ]
@@ -556,10 +549,18 @@
         "Algorithms",
         "Transforming"
       ]
     },
     {
+      "slug": "bank-account",
+      "difficulty": 5,
+      "topics": [
+        "Optional values",
+        "Concurrency"
+      ]
+    },
+    {
       "slug": "markdown",
       "difficulty": 5,
       "topics": [
         "Parsing",
         "Transforming",
@@ -570,9 +571,16 @@
       "slug": "run-length-encoding",
       "difficulty": 5,
       "topics": [
         "Algorithms",
         "Transforming"
+      ]
+    },
+    {
+      "slug": "book-store",
+      "difficulty": 5,
+      "topics": [
+        "Recursion"
       ]
     },
     {
       "slug": "tournament",
       "difficulty": 6,