1. This is first of an occasional series looking at mobile messaging technologies.

2. Amazon offers occasional discounts and a reduced rate for student memberships.

3. There was only occasional cellphone contact with the outside world.

4. That absence from official events probably puts the occasional appearance under the microscope.

5. We are seeing continued momentum in the rally, despite some occasional wobbles.

6. I have occasional problems switching camera modes.

7. Software vendors use to ship CDs and occasional updates.

8. An occasional convoy of soldiers drove by.