question: public static Instances rmCoveredBySuccessives ( Instances data , ArrayList < Rule > rules , int index ) { Instances rt = new Instances ( data , 0 ) ; for ( int i = 0 ; i < data . numInstances ( ) ; i ++ ) { Instance datum = data . instance ( i ) ; boolean covered = false ; for ( int j = index + 1 ; j < rules . size ( ) ; j ++ ) { Rule rule = rules . get ( j ) ; if ( rule . covers ( datum ) ) { covered = true ; break ; } } if ( ! covered ) { rt . add ( datum ) ; } } return rt ; }
target:  Static utility function to count the data covered by the rules after the given index in the given rules, and then remove them. It returns the data not covered by the successive rules.