Furthermore, patterns and common features prove all too elusive.

Commercial features have proved to be significant in the adjustment of the native population.

This last feature proved problematic in the extreme conditions of the Eastern Front.

The feature proved to be so successful that it has since been expanded to every Friday afternoon, all year long.

These features often prove themselves attractive to businesses, especially with those operating large fleets which can sometimes be in the thousands of vehicles.

These new features proved very popular, and many of them have since been copied by other Unix shells.

These features proved unsuccessful and were omitted from subsequent aircraft.

This latter feature proved ideal for the naval delegations which came from points all around the world.

This feature proved useful very soon after the new calendar came into effect.

This feature has proven difficult to identify in subsequent lunar photographs and observations.