while ((eLine = dis1.readLine()) != null) {
fLine = dis2.readLine().trim();
eLine = eLine.trim();
String[] tokens = fTokenizer.processContent(fLine);
lastDocLenF += tokens.length;
for (String token : tokens) {
if (!fDoc.containsKey(token)) { // if this is first time we saw token in this sentence
dfD.increment(token);