RandomAccessFile file = new RandomAccessFile(document, "r");
            StringBuffer currentSeq = new StringBuffer();
            char last = '0';
            boolean add = false;
            if (offset == 0) {
                add = true;
            }
            else {
                file.skipBytes(offset-1);
                last = (char) file.readByte();
                if (sep.indexOf(last) != -1) {
                    add = true;
                }
            }
            for (int i = 0; i < toRead; i++) {
                last = (char) file.readByte();
                if (sep.indexOf(last) != -1) {
                    add = true;
                }
                if (add) {
                    currentSeq.append(last);
                }
            }
            int pos = toRead + offset;
            while (sep.indexOf(last) == -1 && pos < fileSize) {
                pos++;
                last = (char) file.readByte();
                currentSeq.append(last);
            }
            String sentence = currentSeq.toString();
            file.close();