Inform is a synonym of Understand. Understand requires Think. Think is related to Hope. Hope is related to Expectation. 
Custom is a synonym of Use. Use is related to Cotton. Cotton is a different concept from Silk. Silk is related to Work. 
Inform <--Synonym--> Understand --HasPrerequisite--> Think <--RelatedTo--> Hope <--RelatedTo--> Expectation 
Custom <--Synonym--> Use <--RelatedTo--> Cotton <--DistinctFrom--> Silk <--RelatedTo--> Work 