public String expand(String in) {
    ArrayList<String> s = new ArrayList<String>();
    String c = "", n = "";

    for (char a : in.toCharArray()) {
        if (Character.isAlphabetic(a) || Character.isDigit(a)) {
            StringBuilder temp = new StringBuilder();
            temp.append(c);
            temp.append(a);
            c = temp.toString();
        } else if (Character.isWhitespace(a)) {
            s.add(c);
            s.add(" ");
            c = "";
        } else if (c.length() > 0) {
            s.add(c);
            c = "";
            StringBuilder temp = new StringBuilder();
            temp.append(a);
            temp.append("");
            s.add(temp.toString());
        } else {
            StringBuilder temp = new StringBuilder();
            temp.append(a);
            temp.append("");
            s.add(temp.toString());
        }
    }

    s.add(c);

    for (String a : s) {
        if (ABBREVIATIONS.containsKey(a)) {
            StringBuilder temp = new StringBuilder();
            temp.append(n);
            temp.append(ABBREVIATIONS.get(a));
            n = temp.toString();
        } else {
            StringBuilder temp = new StringBuilder();
            temp.append(n);
            temp.append(ABBREVIATIONS.get(a));
            n = temp.toString();
        }
    }
    return n;
}