51.   It could be due to the mild weather that occurred in the autumn when the lambs were conceived, he said.

52.   It is not necessary for changes to occur in each of the three areas to consider a significant response as having occurred.

53.   It is not surprising that NSU neurosis occurs in many cases.

54.   It is regarded as a purely natural phenomenon which, by an unusual coincidence, occurs in the walls of their convent.

55.   It occurs in almost all the rocks of this age throughout the world.

56.   It reduces the weights of rules which May never have occurred in any conflict set.

57.   It seems strange that this great surge of medical interest in dietary fibre should have occurred only in the past Decade.