Bhante Gunaratana briefly discusses the remaining four of the five categories of selected phenomena: the five aggregates, the six senses and sense objects, the seven factors of enlightenment, and the four Nobel Truths.  A point Bhante G has often found to be confusing to many students is the meaning of internal, external and both internal and external.  Internal, external and both internal and external are defined and related to the Four Foundations of Mindfulness.