diff --git a/test/pure/abc.n3s b/test/pure/abc.n3s
new file mode 100644
index 0000000..a79b6ec
--- /dev/null
+++ b/test/pure/abc.n3s
@@ -0,0 +1,25 @@
+@prefix : <urn:example:> .
+@prefix log: <http://www.w3.org/2000/10/swap/log#> .
+
+() log:onNegativeSurface {
+    :A a :Test .
+    () log:onNegativeSurface {
+       :C a :Test .
+    } .
+} .
+
+() log:onNegativeSurface {
+    :B a :Test .
+    :C a :Test .
+} .
+
+() log:onNegativeSurface {
+    () log:onNegativeSurface {
+        :A a :Test .
+        :B a :Test .
+        :C a :Test .
+    } .
+    () log:onNegativeAnswerSurface {
+        :test :is true .
+    } .
+} .