Toy is related to Have. Have is related to Belong. 
Sum is a synonym of Calculation. Estimate is a type of Calculation. Estimate is a synonym of Idea. Idea is related to Innovative. 
Toy <--RelatedTo--> Have <--RelatedTo--> Belong 
Sum <--Synonym--> Calculation <--IsA-- Estimate <--Synonym--> Idea <--RelatedTo--> Innovative 