Basic is related to Rice. Rice is related to Grass. Grass is a type of Unfold. 
Size is related to Term. Term is related to Bill. Bill is related to Must. Must is the opposite of Should. 
Basic <--RelatedTo--> Rice <--RelatedTo--> Grass --IsA--> Unfold 
Size <--RelatedTo--> Term <--RelatedTo--> Bill <--RelatedTo--> Must <--Antonym--> Should 