Loop is etymologically related to Leap. Loop is a type of Program. Program is a type of System. System is a synonym of Scheme. 
Arrive is related to Enter. Enter is related to Sign. 
Leap <--EtymologicallyRelatedTo-- Loop --IsA--> Program --IsA--> System <--Synonym--> Scheme 
Arrive <--RelatedTo--> Enter <--RelatedTo--> Sign 