Can you explain how the interaction between single or multiple awards and enterprise agreements impacts the preparation of staffing rosters? Specifically, how would you incorporate award provisions for leave, mandated breaks between shifts, maximum allowed shift hours, standard, overtime, and penalty pay rates, as well as allocate overall hours to different staff members? Additionally, in what ways would you consider the use of contractors and their associated fees, as well as decide between hiring permanent or casual staff while preparing these rosters