Sail is a different concept from Steam. Steam is related to River. River is related to Clean. Clean is related to Shower. 
Stumble is a type of Move. Play is a type of Move. 
Sail <--DistinctFrom--> Steam <--RelatedTo--> River <--RelatedTo--> Clean <--RelatedTo--> Shower 
Stumble --IsA--> Move <--IsA-- Play 