examples/include.md in markdown_exec-1.7 vs examples/include.md in markdown_exec-1.8

@@ -1,12 +1,19 @@
 ```bash :(one)
-a
+echo block "one"
 ```
+
 ```bash :two +(one)
-b
+echo block "two" requires one
 ```
+
 ```bash :(three) +two +(one)
-c
+echo block "three" requires two and one
 ```
+
 ```bash :four +(three)
-d
+echo block "four" requires three
+```
+
+```bash :trigger_unmet_dependency +(unmet)
+echo block "five" requires an unmet dependency
 ```