VPE-RES system has been tested on 644 examples of VPE from Penn Treebank. This can be addressed with Transformation-based learning. For each pair, try deleting right-most element of system choice for all matching examples. If so, save pair on goodpairs list, with number indicating amount of improvement. Pick pair that produced most improvement.
Improved file becomes new system choice file.
Repeat until no improving pair is found. Both files tagged for part of speech Look at all four-grams of Input file. If they are closer together, save transformation, with number attached indicating how much improvement was acheived. Select best transformation, use it to create improved input file. Repeat process with improved input file, until no transformation leads to improvement.