Invention is a synonym of Design. Design is related to Clothes. Clothes is related to Sleeve. Sleeve is related to Cover. 
Answer is related to Remark. Remark is related to Note. 
Invention <--Synonym--> Design <--RelatedTo--> Clothes <--RelatedTo--> Sleeve <--RelatedTo--> Cover 
Answer <--RelatedTo--> Remark <--RelatedTo--> Note 