Filter filter = aset.createFilter(data);
Instances newData = Filter.useFilter(data, filter);
for (int i = 0, cnt = newData.numInstances(); i < cnt; i++) {
Instance processed = newData.instance(i);
// System.err.println(processed);
assertEquals(aset.size(), processed.numAttributes());
} // WHILE
assertEquals(data.numInstances(), newData.numInstances());
// System.err.println("MarkovAttributeSet: " + aset);
}