Subject is related to Reading. Reading is related to Purpose. Purpose is related to Cause. Cause is the opposite of Prevent. 
Choose is the opposite of Force. Force is related to Do. 
Subject <--RelatedTo--> Reading <--RelatedTo--> Purpose <--RelatedTo--> Cause <--Antonym--> Prevent 
Choose <--Antonym--> Force <--RelatedTo--> Do 