Power is a synonym of Arm. you are likely to find Arm in/at/on House. House is related to Personal. Personal is related to Pin. 
Bed is related to River. River is related to Mass. Mass is related to Science. 
Power <--Synonym--> Arm --AtLocation--> House <--RelatedTo--> Personal <--RelatedTo--> Pin 
Bed <--RelatedTo--> River <--RelatedTo--> Mass <--RelatedTo--> Science 