61.   The effect of such formulations on those who enacted education policy is difficult to estimate.

62.   It is possible to use concrete but, if there is any settlement in the ground and cracks appear, they are very difficult to repair.

63.   The frequency of occurrence of such theses within this present work was very difficult to estimate, but is likely to be very low.

64.   Apart from the west end, Antwerp cathedral is exceptionally difficult to view.

65.   The van was crowded with men in damp overcoats, and their weight made it difficult to control over the hard bumpy ice.

66.   Experimentally this is difficult to measure, and an extrapolation procedure has been devised which makes use of a modified form of equation for large particles,

67.   Relations are normalised because unnormalised relations prove difficult to use.

68.   Another point is that it could be difficult to direct members to the book shelves, CAL area etc if only one desk was planned.

69.   Such changes are always difficult to work through and additional constraints would be very frustrating for the association and its members.