diff --git a/tf_fuzz/demo/17.test b/tf_fuzz/demo/17.test
deleted file mode 100644
index bdaeece..0000000
--- a/tf_fuzz/demo/17.test
+++ /dev/null
@@ -1,8 +0,0 @@
-purpose to try some more-complex randomization;
-set sst name neil buzz mike data *;
-2 to 5 of {
-    set sst name neil data "that's one small step for [a] man";
-    remove sst *active;
-    set sst name chris kraft data "wear the helmet";
-    remove sst name neil;
-}
diff --git a/tf_fuzz/demo/25.5.test b/tf_fuzz/demo/25.5.test
new file mode 100644
index 0000000..cea2279
--- /dev/null
+++ b/tf_fuzz/demo/25.5.test
@@ -0,0 +1,3 @@
+purpose to create a random valid policy and create a key using it (no key material specified);
+set policy name randomPolicy valid;
+set key name akey policy randomPolicy;
diff --git a/tf_fuzz/demo/28.test b/tf_fuzz/demo/28.test
index e9fd0d8..0faee18 100644
--- a/tf_fuzz/demo/28.test
+++ b/tf_fuzz/demo/28.test
@@ -1,4 +1,4 @@
 purpose to create a key, then read the key data ("material") into a variable;
-set policy name somePolicy alg sha3_224 attr noexport volatile;
+set policy name somePolicy alg cfb attr noexport volatile valid;
 set key name aKey data * policy somePolicy;
 read key name aKey var keyDataVar;
diff --git a/tf_fuzz/demo/29.test b/tf_fuzz/demo/29.test.disabled
similarity index 100%
rename from tf_fuzz/demo/29.test
rename to tf_fuzz/demo/29.test.disabled
diff --git a/tf_fuzz/demo/36.test b/tf_fuzz/demo/36.test
new file mode 100644
index 0000000..fc8e4cf
--- /dev/null
+++ b/tf_fuzz/demo/36.test
@@ -0,0 +1,12 @@
+purpose to have a more even chance of creating a valid or invalid key;
+
+/*
+ most completely random keys will be invalid so something like this helps get
+ more valid keys into the mix
+ */
+
+1 of {
+set policy name randomPolicy valid;
+set policy name randomPolicy;
+}
+set key name akey policy randomPolicy;