Consider the following scenario: A customer has asked to determine their Hires, Terminations, and Movement Events using the following Event codes: H -- Hire P -- Promotion D -- Demotion X -- Transfer T -- Termination. Promotions are only counted if there is an increase in the Salary Band and Demotions are only counted if there is a decrease in the Salary Band. What is the minimum number of Hire/Movement/Termination conditions that can be created to fulfill these requirements?