1.   Another concern centers on focal plane arrays, widely used sensors that help guide missiles, tanks and other military systems.

2.   Civil libertarians offer broad support for reform as well, but their concerns center on how new technology and information sharing might be used.

3.   Other Serbian concerns center on the land accorded to the Muslim-Croatian federation in eastern Bosnia on the border with Serbia.

4.   Their concern centers on the yellow square of paper Wood carried on his hike.

5.   Much of their concern centers on tensions in the Middle East and the increasing number of people who have stood up publicly to deny the Holocaust, he said.