Remain is related to Action. Action is part of Gun. Gun is a synonym of Speed. Speed is a synonym of Book. 
Shadow is related to Reflection. you are likely to find Reflection in/at/on Sea. Sea is related to Shark. Shark is related to Water. 
Remain <--RelatedTo--> Action --PartOf--> Gun <--Synonym--> Speed <--Synonym--> Book 
Shadow <--RelatedTo--> Reflection --AtLocation--> Sea <--RelatedTo--> Shark <--RelatedTo--> Water 