21.   The system depends not on tracking harm, but on devising well-planned experiments that assure reasonable safety.

22.   The system depends on use of a heart-lung machine hooked to an artery in the groin.

23.   The whole system depends on altruism, and altruism depends on clear standards that everyone agrees to.

24.   To make matters worse, the entire system depends on a small number of ground-based radars, including one located on Shemya Island in Alaska.

25.   But such a system should not depend on intervention by the future European central bank.

26.   The system depends on a technique, called DirecPC, developed by Hughes Network Systems.