91.   The relatively small proportion of such theses made it difficult to come to any statistically valid conclusions about the differences in use between Ph D and M Sc theses.

92.   This in turn may make it difficult for the manager to evoke commitment and enthusiasm.

93.   The links were often circuitous, narrow and made more difficult by differing levels.

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

95.   There are of course also limitations in current screen and power source technology which would make it difficult to display high resolution colour images of any complexity.

96.   This successful sequence made life difficult for those who followed the stars of Geoffrey Howe or Edward Heath.

97.   To prevent Italians leaving, emigrating was made increasingly difficult.

98.   But variety made it difficult to maintain consistent quality.

99.   As they walked back to the clubhouse with the Vice-Captain, conversation was made difficult by the roar and whirr of a helicopter hovering over the field behind.

100.   Such practical failures make it difficult to sustain economic solidarity, political unity or cultural-ideological sympathy.