1.   True, his was a tireless search for the winning edge, and he delighted in finding a loophole in the rules.

2.   Another key factor is a major restructuring of corporate America due to technological innovation and a seemingly tireless search for improvements in productivity and profits.

3.   Another key factor is the major restructuring of corporate America due to technological innovation and a seemingly tireless search for improvements in productivity and profits, analysts said.

4.   Police officers and firefighters continued their tireless search for trapped residents, traveling the streets by boat to look through buildings as helicopters hovered overhead.