Electrical is related to Metal. Metal is related to Material. Material is related to Stone. Stone is related to Round. 
Hall is related to Stage. Stage is related to Baby. Baby is related to Man. 
Electrical <--RelatedTo--> Metal <--RelatedTo--> Material <--RelatedTo--> Stone <--RelatedTo--> Round 
Hall <--RelatedTo--> Stage <--RelatedTo--> Baby <--RelatedTo--> Man 