81.   But they also have braincells to rub together -- something that outsiders find difficult to stomach.

82.   Some computer programs are marketed in a form that makes them difficult to copy.

83.   Those exceptions are difficult to state.

84.   Separately preserved and more difficult to date than these are the precepts of Childebert I and Chlothar II.

85.   The electorates in the open boroughs and in the counties were much more difficult to control.

86.   There are children so painfully shy that they find it difficult to voice publicly Yes or No.

87.   The magnitude of this effect is difficult to estimate, but it will depend in part on the flexural rigidity of the lithosphere.

88.   However, such quantities are difficult to measure and so have received less attention.

89.   On the other hand, admissions to Tertiary Colleges are far more difficult to control.

90.   According to Neal, two of the patterns which it is most difficult to plan accurately are eight-lozenge star arrangements and arrangements of juggled, interlaced squares.