Trip is related to Vacation. People wants (to) Vacation. People can be Friendly. Friendly is a different concept from Enemy. 
Retain is a type of Remember. Remember is related to Action. Action is related to Reach. Reach is a type of Be. 
Trip <--RelatedTo--> Vacation <--Desires-- People --HasProperty--> Friendly <--DistinctFrom--> Enemy 
Retain --IsA--> Remember <--RelatedTo--> Action <--RelatedTo--> Reach --IsA--> Be 