Iraqi is related to War. War is related to Side. Side is a different concept from Center. 
Guilt is related to Bad. Bad is related to Depression. Depression is related to Economics. 
Iraqi <--RelatedTo--> War <--RelatedTo--> Side <--DistinctFrom--> Center 
Guilt <--RelatedTo--> Bad <--RelatedTo--> Depression <--RelatedTo--> Economics 