Floor is related to Basis. Basis is a type of Explanation. Excuse is a type of Explanation. 
Price is related to Reserve. Devote is a type of Reserve. Devote is a synonym of Give. Give is a type of Think. 
Floor <--RelatedTo--> Basis --IsA--> Explanation <--IsA-- Excuse 
Price <--RelatedTo--> Reserve <--IsA-- Devote <--Synonym--> Give --IsA--> Think 