private void appendPartWord(StringBuilder builder) {
		builder.append("-----------------------part of word-----------------------\n");
		int i = 0;
		Iterator<Entry<String, Word>> it = wordMap.entryiterator();
		Entry<String, Word> entry;
		while (it.hasNext()) {
			entry = it.next();
			builder.append(entry.getKey()).append(":")
					.append(entry.getValue().freq()).append("\t");
			i++;
			if (i % 8 == 0) {
				builder.append("\n");
			}
			if (i >= 80) {
				break;
			}
		}

	}