diff --git a/design/rimuovi-is-a.pen b/design/rimuovi-is-a.pen
new file mode 100644
index 00000000..0090d6e6
--- /dev/null
+++ b/design/rimuovi-is-a.pen
@@ -0,0 +1,375 @@
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+            },
+            {
+              "type": "text",
+              "id": "beforeDupNote",
+              "content": "⚠ Duplicate! 'is_a' duplicates 'Type'",
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+                  "content": "Feb 23, 2026",
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+}