Как несколько циклов сделать одним?

Понимаю, что код громоздкий. Как три while сделать одним?

Код (Text):

1. $continent_list = mysql_query("SELECT * FROM continents");
2. echo "<table>";
3. while ($continent = mysql_fetch_array ($continent_list))
4. {
5.     echo "<tr><td>".$continent['continent_name']."</td>";
6.    
7.     $country_qty = mysql_query("SELECT COUNT(*) FROM countries WHERE continent = ".$continent['continent_id']."");
8.     $c_qty = mysql_fetch_row($country_qty);
9.     $t_qty = $c_qty[0];
10.     $qty = ceil($t_qty / 3);
11.    
12.     echo "<td>";
13.     $country_list = mysql_query("SELECT * FROM countries WHERE continent = ".$continent['continent_id']." ORDER BY country_name LIMIT 0,".$qty."");
14.     while ($country = mysql_fetch_array ($country_list))
15.     {
16.         echo $country['country_name']."<br>";
17.     }
18.     echo "</td>";
19.     echo "<td>";
20.     $country_list = mysql_query("SELECT * FROM countries WHERE continent = ".$continent['continent_id']." ORDER BY country_name LIMIT ".$qty.",".$qty."");
21.     while ($country = mysql_fetch_array ($country_list))
22.     {
23.         echo $country['country_name']."<br>";
24.     }
25.     echo "</td>";
26.     echo "<td>";
27.     $qty2 = $qty * 2;
28.     $qty3 = $t_qty - $qty2;
29.     $country_list = mysql_query("SELECT * FROM countries WHERE continent = ".$continent['continent_id']." ORDER BY country_name LIMIT ".$qty2.",".$qty3."");
30.     while ($country = mysql_fetch_array ($country_list))
31.     {
32.         echo $country['country_name']."<br>";
33.     }
34.     echo "</td></tr>";
35. }
36. echo "</table>";