41.   In places the trees do grow more thickly and pines occur in some hilly areas.

42.   In practice the probability of such words occurring in adjacent positions is so low that the problem is negligible.

43.   In the equal-opportunities field observers can analyse the talk which occurs in a mixed class.

44.   In the event of death occurring in such a case I would accept that it could be an unnatural death.

45.   In the twentieth century, three main changes have occurred in this ownership of agricultural land.

46.   In these cases, letter string combinations are only ruled out if they do not occur in the sample source.

47.   Indeed, leukaemia clusters occur in areas that are far removed from nuclear installations.

48.   Independent characters when used as partial components in compound characters sometimes occur in different positions in these more complex graphs.

49.   It also occurs in the context of political protest.