diff --git a/src/haz3lweb/exercises/examples/BlankExercise.ml b/src/haz3lweb/exercises/examples/BlankExercise.ml
index 8e60e23e58..c3e14055da 100644
--- a/src/haz3lweb/exercises/examples/BlankExercise.ml
+++ b/src/haz3lweb/exercises/examples/BlankExercise.ml
@@ -2,7 +2,8 @@ open Haz3lcore
 
 let exercise : Exercise.spec =
   {
-    id = Option.get (Id.of_string "7d3f9e28-a415-4b92-8c64-9f23d1678459");
+    id =
+      Option.get (Haz3lcore.Id.of_string "7d3f9e28-a415-4b92-8c64-9f23d1678459");
     title = "";
     module_name = "";
     prompt = "";
@@ -15,8 +16,17 @@ let exercise : Exercise.spec =
         relatives =
           {
             siblings =
-              ( [ Grout { id = Id.mk (); shape = Convex } ],
-                [ Grout { id = Id.mk (); shape = Convex } ] );
+              ( [
+                  Grout
+                    {
+                      id =
+                        Option.get
+                          (Haz3lcore.Id.of_string
+                             "f2130f9f-a452-481b-ba9a-c40e0d2346aa");
+                      shape = Convex;
+                    };
+                ],
+                [] );
             ancestors = [];
           };
         caret = Outer;
@@ -28,8 +38,17 @@ let exercise : Exercise.spec =
         relatives =
           {
             siblings =
-              ( [ Grout { id = Id.mk (); shape = Convex } ],
-                [ Grout { id = Id.mk (); shape = Convex } ] );
+              ( [
+                  Grout
+                    {
+                      id =
+                        Option.get
+                          (Haz3lcore.Id.of_string
+                             "b371b234-c6ab-4e88-a8aa-f42c3fd24d6c");
+                      shape = Convex;
+                    };
+                ],
+                [] );
             ancestors = [];
           };
         caret = Outer;
@@ -43,8 +62,17 @@ let exercise : Exercise.spec =
             relatives =
               {
                 siblings =
-                  ( [ Grout { id = Id.mk (); shape = Convex } ],
-                    [ Grout { id = Id.mk (); shape = Convex } ] );
+                  ( [
+                      Grout
+                        {
+                          id =
+                            Option.get
+                              (Haz3lcore.Id.of_string
+                                 "0f65226c-718c-4e8e-8aae-a43ef4b2805c");
+                          shape = Convex;
+                        };
+                    ],
+                    [] );
                 ancestors = [];
               };
             caret = Outer;
@@ -59,8 +87,17 @@ let exercise : Exercise.spec =
         relatives =
           {
             siblings =
-              ( [ Grout { id = Id.mk (); shape = Convex } ],
-                [ Grout { id = Id.mk (); shape = Convex } ] );
+              ( [],
+                [
+                  Grout
+                    {
+                      id =
+                        Option.get
+                          (Haz3lcore.Id.of_string
+                             "66465f81-0867-4b8e-ae01-99f667cfbe7f");
+                      shape = Convex;
+                    };
+                ] );
             ancestors = [];
           };
         caret = Outer;
@@ -75,8 +112,17 @@ let exercise : Exercise.spec =
             relatives =
               {
                 siblings =
-                  ( [ Grout { id = Id.mk (); shape = Convex } ],
-                    [ Grout { id = Id.mk (); shape = Convex } ] );
+                  ( [
+                      Grout
+                        {
+                          id =
+                            Option.get
+                              (Haz3lcore.Id.of_string
+                                 "7e32de55-c4b6-4d48-a672-a2e50ff9f98d");
+                          shape = Convex;
+                        };
+                    ],
+                    [] );
                 ancestors = [];
               };
             caret = Outer;