Privately run sites are more difficult to include.
Many publishers find it difficult to include visual material in books.
These two displacement contributing factors are difficult to include in analysis.
Nevertheless, the runner has complex boundary conditions that are difficult to include in the computational model.
For instance, it might be difficult to include provisions related to insurance coverage for abortions.
In a preliminary experiment, we observed that developers find it difficult to include the concept of context in their applications.
Slipstream is affected by the movement of the train relative to the ground, but this is difficult to include in wind-tunnel tests.
DEBORAH TREISMAN: We found it difficult to include writers who were very early in their careers — who had written only a few stories.
I think it's very, very difficult to include Off Broadway, but certainly we should -- and yet, for some reason, we can't.
But would it have been so difficult to include a few of Picasso's collages, or some reference to the African art that inspired so many of his creations?
In the energy sector the uncertainty of future direction of changes in prices makes it difficult to include an adequate price vector in the design.
