Holiday is related to Camp. Camp is related to Location. Location is related to Farm. Farm is related to Agricultural. 
Volume is a synonym of Space. Space can be used for Storage. Storage is related to Unit. 
Holiday <--RelatedTo--> Camp <--RelatedTo--> Location <--RelatedTo--> Farm <--RelatedTo--> Agricultural 
Volume <--Synonym--> Space --UsedFor--> Storage <--RelatedTo--> Unit 