diff --git a/lib/pangea/models/analytics/construct_list_model.dart b/lib/pangea/models/analytics/construct_list_model.dart
index 747a54bb4..80de03f53 100644
--- a/lib/pangea/models/analytics/construct_list_model.dart
+++ b/lib/pangea/models/analytics/construct_list_model.dart
@@ -36,13 +36,8 @@ class ConstructListModel {
     final Map<String, List<OneConstructUse>> lemmaToUses = {};
     for (final use in uses) {
       if (use.lemma == null) continue;
-      lemmaToUses[use.lemma! +
-          use.constructType.string +
-          (use.category ?? "Other")] ??= [];
-      lemmaToUses[use.lemma! +
-              use.constructType.string +
-              (use.category ?? "Other")]!
-          .add(use);
+      lemmaToUses[use.identifier.string] ??= [];
+      lemmaToUses[use.identifier.string]!.add(use);
     }
 
     _constructMap = lemmaToUses.map(
diff --git a/lib/pangea/models/analytics/constructs_model.dart b/lib/pangea/models/analytics/constructs_model.dart
index e4e006952..12e6b74c8 100644
--- a/lib/pangea/models/analytics/constructs_model.dart
+++ b/lib/pangea/models/analytics/constructs_model.dart
@@ -1,6 +1,7 @@
 import 'dart:developer';
 
 import 'package:fluffychat/pangea/enum/construct_use_type_enum.dart';
+import 'package:fluffychat/pangea/models/practice_activities.dart/practice_activity_model.dart';
 import 'package:fluffychat/pangea/utils/error_handler.dart';
 import 'package:flutter/foundation.dart';
 import 'package:matrix/matrix.dart';
@@ -161,6 +162,12 @@ class OneConstructUse {
   }
 
   int get pointValue => useType.pointValue;
+
+  ConstructIdentifier get identifier => ConstructIdentifier(
+        lemma: lemma!,
+        type: constructType,
+        category: category,
+      );
 }
 
 class ConstructUseMetaData {
diff --git a/lib/pangea/models/practice_activities.dart/practice_activity_model.dart b/lib/pangea/models/practice_activities.dart/practice_activity_model.dart
index ccdd3802a..e5048400d 100644
--- a/lib/pangea/models/practice_activities.dart/practice_activity_model.dart
+++ b/lib/pangea/models/practice_activities.dart/practice_activity_model.dart
@@ -12,7 +12,7 @@ import 'package:sentry_flutter/sentry_flutter.dart';
 class ConstructIdentifier {
   final String lemma;
   final ConstructTypeEnum type;
-  String? category;
+  final String? category;
 
   ConstructIdentifier({
     required this.lemma,
@@ -68,6 +68,9 @@ class ConstructIdentifier {
   int get hashCode {
     return lemma.hashCode ^ type.hashCode;
   }
+
+  String get string =>
+      "$lemma-${type.string}${category != null ? "-$category" : "-other"}";
 }
 
 class CandidateMessage {