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Used to go over all the groups that belong to a certain group.
Example:
for(DWORD house_part=STATE_group_get_first_included_group(house_group); house_part!=NULL; house_part=STATE_group_get_next_included_group(house_group, house_part) ) {
Deal with the various house parts such as roof, windows, door etc ...
}
Note:
Don't mix this function with STATE_group_get_first_group() and
STATE_group_get_next() which are used to go over ALL the existing groups
To go over all the groups the belong to a certain object use STATE_object_get_group_handle() as the top group handle
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