Railroad is related to Path. Walk is a type of Path. Walk is related to Slow. Watch can be Slow. 
Agent is a type of Broker. Agent is related to Air. Air is related to Gas. Gas is a synonym of Turn. 
Railroad <--RelatedTo--> Path <--IsA-- Walk <--RelatedTo--> Slow <--HasProperty-- Watch 
Broker <--IsA-- Agent <--RelatedTo--> Air <--RelatedTo--> Gas <--Synonym--> Turn 