/**
* Checks for groups containing second-level data key
*
* @param key top-level key to check
* @param key2 second-level key to check
* @return Collection of groups containing keys
*/
public Collection<OddItemGroup> getGroups(String key, String key2) {
Collection<OddItemGroup> groups = new HashSet<OddItemGroup>();
for (OddItemGroup group : this.groups.values()) if (group.match(key, key2)) groups.add(group);
return groups;
}
