for (int i=0; i<numClassifiers; i++) {
RemoveWithValues classFilter = new RemoveWithValues();
classFilter.setAttributeIndex("" + (insts.classIndex() + 1));
classFilter.setModifyHeader(true);
classFilter.setInvertSelection(true);
classFilter.setNominalIndicesArr((int[])pairs.elementAt(i));
Instances tempInstances = new Instances(insts, 0);
tempInstances.setClassIndex(-1);
classFilter.setInputFormat(tempInstances);
newInsts = Filter.useFilter(insts, classFilter);
if (newInsts.numInstances() > 0) {