The reduction of engine power referred to in points(b) and (c) of paragraph 2 may be achieved by a group of vessels for each category of vessel referred to in those points.
An laghdú ar an gcumhacht innill dá dtagraítear i mír 2(b) agus 2(c), féadfaidh grúpa soithí é a bhaint amach do gach catagóir soithí dá dtagraítear sna pointí sin.