MachineruleinductionwasexaminedonadifficultcategorizationproblembyapplyingaHollandstyleclassifiersystemtoacomplexletterrecognitiontask.Asetof20,000uniqueletterimageswasgeneratedbyrandomlydistortingpixelimagesofthe26uppercaselettersfrom20differentcommercialfonts.Theparentfontsrepresent