The difficulties surrounding flight at sonic speeds appeared to increase with increasing knowledge.

There appears an insurmountable difficulty in respect of lottery tickets.

But the biggest difficulty appears to be over the top leader.

The difficulty appears when there is no natural choice of elements from each set.

The only difficulty would appear to be if an object remained too long in this universe.

A special difficulty appears during song select that lets players play with their hands and feet at the same time.

It is after they have lost control for the second or third time that the real difficulties appear.

But the difficulties that have hit the region full force since the New Year appeared to shape the meeting's agenda and atmosphere.

The difficulties, which most described as a clash of egos between the two, were severe - and appeared fast.

The problem is knowing what conditions this occurs under and it is here that some small difficulties appear.