src/main/java/seedu/address/model/ModelManager.java
@Override
    public void updateObservedExtraFilteredStaffList(Predicate<Staff> predicate) {
        requireNonNull(predicate);
        filteredStaffs.setPredicate(predicate);
        filteredStaffs.setPredicate(predicate);
    }
/**
     * Update Observed Extra filtered staff list.
     */
Update Observed Extra filtered staff list.
Update Observed Extra filtered staff list .
@Override
    public void updateObservedExtraFilteredStaffList(Predicate<Staff> predicate) {
        requireNonNull(predicate);
        filteredStaffs.setPredicate(predicate);
        filteredStaffs.setPredicate(predicate);
    }
@ Override public void updateObservedExtraFilteredStaffList ( Predicate < Staff > predicate ) { requireNonNull ( predicate ) ; filteredStaffs . setPredicate ( predicate ) ; filteredStaffs . setPredicate ( predicate ) ; }
Update Observed Extra filtered staff list.
Update Observed Extra filtered staff list .