Example sentences of "[vb -s] them difficult " in BNC.

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1 It also makes them difficult to control .
2 Most of the many suggested grids bear little relation to each other , and their generalized nature makes them difficult to apply to practical Earth Mysteries .
3 tiles are generally stuck in place with a contact adhesive , which makes them difficult to remove if you want to change to another floorcovering .
4 The problem of recruitment administration is not that the individual tasks are difficult , but that the addition of fluctuations in the level of activity makes them difficult .
5 The nature of black holes makes them difficult to detect ; all we may ever have is indirect evidence for their existence .
6 Some computer programs are marketed in a form that makes them difficult to copy .
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