diff --git a/example/ex11-count-lines.c b/example/ex11-count-lines.c
new file mode 100644
index 00000000..afd7462e
--- /dev/null
+++ b/example/ex11-count-lines.c
@@ -0,0 +1,49 @@
+#include <stdio.h>
+
+#include "m-tuple.h"
+#include "m-tree.h"
+#include "m-worker.h"
+#include "m-string.h"
+#include "m-atomic.h"
+
+#define M_OPL_atomic_uint() M_OPEXTEND(M_BASIC_OPLIST, HASH(0))
+
+TUPLE_DEF2( dir, (nlines, atomic_uint), (name, string_t))
+#define M_OPL_dir_t() TUPLE_OPLIST(dir, M_BASIC_OPLIST, M_STRING_OPLIST)
+
+M_TREE_DEF(tree, dir_t)
+
+static tree_t directories;
+
+static void
+scan_directories(const char *dirname)
+{
+
+}
+
+static void
+consolidate_directories(void)
+{
+
+}
+
+static void
+print_result(void)
+{
+  
+}
+
+int main(int argc, const char *argv[])
+{
+  if (argc < 2) {
+    fprintf(stderr, "ERROR. Usage is %s <directory>.\n", argv[0]);
+    exit(1);
+  }
+
+  tree_init(directories);
+  scan_directories(argv[1]);
+  consolidate_directories();
+  print_result();
+  tree_clear(directories);
+  exit(0);
+}