31.   As the first wave of police chased the fleeing demonstrators, a second wave arrived on their tail.

32.   Towards the end of the fourth century, the first wave of Koreans arrived, bringing silkworm cultivation, horsebreeding and a new type of pottery.

33.   The latest wave of refugees arrived in midweek after Bosnian government and Croat attacks were launched in the centre and west of Bosnia.