21. "Rewriting rules that have served us well is fraught with the possibility of collateral damage, " he said. 22. Rewrite rules can be further regulated in the case of labeled graphs, such as in string-regulated graph grammars.23. He also suggests that anaphors and pronouns are rewritten as variables at LF by a Variable Rewriting Rule . 24. Some rewriting rules sometimes increase and sometimes decrease the size of the expressions to which they are applied. 25. For tree automata, transition rules are rewrite rules ; and for top-down ones, the left-hand side will be parent nodes. 26. A key point of disagreement came over a WTO ruling that forced Browner's agency to rewrite rules on imported gasoline. 27. This process can be represented using the following rewrite rules ( Handbook of Automated Reasoning 1, p . 204 ): 28. Another proposal from Third World countries is to rewrite rules that force them to pay prohibitively high prices for pharmaceutical drugs. 29. ReduceAndReconstruct is based on a set of local proof rewriting rules that transform a subproof into an equivalent or stronger one. 30. A GCFG consists of two components : a set of composition functions that combine string tuples, and a set of rewrite rules .