11.   And he said new communication systems tended to evolve in ways their builders never could have predicted.

12.   And the political system tends to respond to the richest and the most powerful people.

13.   As a consequence, he said, longtime board bureaucrats with a vested interest in the current system have tended to resist change.

14.   All heating systems tend to dry the air, but the problem seems more acute with forced air.

15.   All-wheel-drive systems tend to deliver power in greater proportion to either the front or rear wheels.

16.   Current systems tend to generate false alarms and thus require many skilled operators.

17.   Currently, weather systems over North America tend to travel from west to east.

18.   Even though the best automobile model changes every year, the highway and traffic system tend to stay around much, much longer.

19.   However, it requires cranking up the juice so much that such systems tend to emit a lot of radiation and thus create interference with other telecommunications systems.

20.   In addition, the Web-based systems tend to provide more up-to-date information, while data sent through the Intuit network is generally delayed by about a day.