diff --git a/test1.in b/test1.in
new file mode 100644
index 0000000..d82237e
--- /dev/null
+++ b/test1.in
@@ -0,0 +1,9 @@
+xxyz
+xyz
+xy
+zz
+xxy
+yzx
+
+x
+xyzz
diff --git a/test1.out b/test1.out
new file mode 100644
index 0000000..680815f
--- /dev/null
+++ b/test1.out
@@ -0,0 +1,8 @@
+NO
+YES
+NO
+NO
+NO
+NO
+NO
+NO