Welfare is related to Money. Money is related to Roll. Roll is a type of Bread. 
Nasty is a synonym of Tight. Tight is the opposite of Stretch. Machine can be used for Stretch. Machine is related to Artificial. 
Welfare <--RelatedTo--> Money <--RelatedTo--> Roll --IsA--> Bread 
Nasty <--Synonym--> Tight <--Antonym--> Stretch <--UsedFor-- Machine <--RelatedTo--> Artificial 