Rub is the opposite of Walk. Walk is related to Easy. Easy is related to Middle. 
Stare is related to Long. Long is the opposite of Brief. Brief is related to Flash. Flash is related to Take. 
Rub <--Antonym--> Walk <--RelatedTo--> Easy <--RelatedTo--> Middle 
Stare <--RelatedTo--> Long <--Antonym--> Brief <--RelatedTo--> Flash <--RelatedTo--> Take 