ex. added

Author: hhzl

public/demo.html

@@ -22,6 +22,15 @@ <h1>LearnWords2 app -- to be implemented</h1>
 <pre>
 	lw.db.numberOfWords()
 </pre>
+and then
+<pre>
+	lw.db.removeWords()
+</pre>
+followed by
+<pre>
+	lw.db.numberOfWords()
+</pre>
+
 
 	Note: to restart testing evaluate