21.   A series of explosions shook the building.

22.   A series of gale warnings added an edge of tension to the creeping advance of fatigue.

23.   A series of half-stop under- and over-exposure gradations will usually produce one frame which is satisfactory for each.

24.   A series of heated exchanges between the two governments followed.

25.   A series of individual observation and interview measures will be derived on the basis of this ethnography.

26.   A series of lightning flashes crackled overhead.

27.   A series of meetings were held to discuss security issues and teach women employees how to protect themselves.

28.   A series of minor ailments led Grant and Julie to take Maisie to a doctor, and tests revealed leukaemia.

29.   A series of numbered diagrams illustrate the results of the experiment.