private String getPossibilities(Poss poss) {
        String r = "";
        if (size <= 3) {
            String line = "";
            for (int i = 1; i <= size*size; i++) {
                line += "<td>" + (poss.contains(i)? i : "&nbsp") + "</td>";
                if (i % size == 0) {
                    if (possAsNum) {
                        r = "</tr><tr>" + line + r;
                    } else {
                        r += "</tr><tr>" + line;
                    }
                    line = "";
                }
            }
        } else {
            int j = 0;
            for (int n : poss) {
                if (j == 9) {
                    break;
                }
                if (j++ % 3 == 0) {
                    r += "</tr><tr>";
                }
                r += "<td>" + n + "</td>";
            }
            if (r.length() == 0) {
                r = "</tr><tr>";
            }
        }
        r = "<html><table><tr>"
                    + r.substring("</tr><tr>".length())
                    + "</tr></table></html>";
        return r;
    }