51.   We restricted this to vertical movement, because it is more difficult to record horizontal movement accurately.

52.   Yet that sound seems too deep and, while difficult to judge, the bodies seem large next to the small waves.

53.   Some unemployed people can be very difficult to place.

54.   Logistically it is very difficult to value unit-linked policies.

55.   These dictators have entrenched themselves politically and are difficult to move.

56.   I find it difficult to balance on one foot.

57.   This makes bonds more difficult to price than money market instruments.

58.   In the first case the item in question is cheap to produce but the parts to which it assembles are difficult to design and the assembly process demanding.

59.   The relative importance of these components is difficult to estimate.