Reserve is related to Price. Price is related to Tax. Tax is a type of Strain. Strain is a type of Tighten. 
Smoke is related to Artificial. Artificial is related to Doll. Doll is the opposite of Soldier. 
Reserve <--RelatedTo--> Price <--RelatedTo--> Tax --IsA--> Strain --IsA--> Tighten 
Smoke <--RelatedTo--> Artificial <--RelatedTo--> Doll <--Antonym--> Soldier 