diff --git a/pypi-list.py b/pypi-list.py
index 8f1ce55..a546daf 100644
--- a/pypi-list.py
+++ b/pypi-list.py
@@ -71,6 +71,12 @@ pipeline = Pipeline(
             outputs="available",
             name="available",
         ),
+        node(
+            lambda words, packages: list(set(words) & set(packages)),
+            inputs=["words", "packages"],
+            outputs="unavailable",
+            name="unavailable",
+        ),
         node(
             lambda x: x,
             inputs="packages",