21.   They say a return to tighter rules on how electricity is bought and sold will deter construction of much-needed new plants.

22.   Though top auto executives may see tighter rules as inevitable, there remains an undercurrent of hostility here toward any limits on automobiles.

23.   Those restrictions have been augmented by even tighter rules designed to prevent the spread of mad-cow disease.

24.   But for now, the prospect of tighter rules is pushing down stock prices.

25.   Dr. Adrian Rogers of the conservative Family Institute called for tighter rules governing who can receive in vitro fertilization.

26.   Iran swerved back toward tighter rules in the spring, diplomats and Iranians say.

27.   Repeated mud slide tragedies during typhoon season have prompted calls for tighter rules on development of slope land.

28.   Several Japanese activist groups have also been pressing for tighter rules covering child prostitution, including cases which occur in other countries.

29.   Stiffer checks on the background of owners of financial institutions and tighter rules for credit card companies also are included.

30.   The government issued tighter anti-graft rules this month, banning new office construction for three years and restricting installation of personal telephones at public expense.