Relax requires Rest. Rest is related to Relation. 
Fluid is a type of Substance. Substance is related to Rice. Rice can be White. White is related to Buy. 
Relax --HasPrerequisite--> Rest <--RelatedTo--> Relation 
Fluid --IsA--> Substance <--RelatedTo--> Rice --HasProperty--> White <--RelatedTo--> Buy 