Local search results. Summary of the effects of adding one (giving 32 grammars) or two (giving 961 grammars) production rules to KH99′. The plot shows the cumulative proportion of grammars with given sensitivity. The grammars’ sensitivity is mostly still equal to the sensitivity of KH99′, with only a few outliers. GG1 was the top outlier for two production rule added. In this sense the space is reasonably flat.