Such leading edge work requires a combination of theory and empirical approaches.

Meeting our our future energy needs is going to require a combination of approaches.

It will require a combination of modest benefit cuts and tax increases.

To achieve that result required a combination of legal, social and political action.

Some patients may require a combination of these approaches.

He required a combination of valleys, woods, lake and open space.

Difficult cases may require a combination of both drugs.

Some patients require a combination of surgery, radiation and chemotherapy.

As we all know, preventing this requires a combination of a great many measures.

A championship requires a combination of points and competition wins.