Chunks... And Yaml

hello! I have an question, im stuck.
I have list witch chunks:
http://pastebin.com/n3477P8f

And how i can get how mutch chunks Owning_Kingdom : arror

Any ideas?

 

Code:

/**
 * Gets all chunks belonging to kingdom from config
 * @param kingdom Kingdom name to search ownership
 * @return Set of chunks belonging to kingdom
 */
Set<String> getChunksByKingdom(String kingdom) {
    Set<String> list = new HashSet<String>();
    for(Object key : getConfig().getConfigurationSection("chunks").getKeys(false).toArray()) {
        String chunk = key.toString();
        if(getConfig().getString("chunks." + chunk + ".owning_kingdom").equalsIgnoreCase(kingdom))
            list.add(chunk);
    }
 
    return list;
}
 
Set<String> arrows = getChunksByKingdom("arrow");