Additional is related to Tax. Tax is related to Country. Country is related to World. World is a type of Little. 
Formula is a type of Statement. Formula is a synonym of Convention. Nation is a type of Convention. Nation is related to Kingdom. 
Additional <--RelatedTo--> Tax <--RelatedTo--> Country <--RelatedTo--> World --IsA--> Little 
Statement <--IsA-- Formula <--Synonym--> Convention <--IsA-- Nation <--RelatedTo--> Kingdom 