Tail is a synonym of Ass. you are likely to find Pain in/at/on Ass. Pain is related to Nerve. Nerve is related to Sensor. 
Intense is similar to Deep. Deep is the opposite of Light. Light is a synonym of Easy. Easy is related to Luck. 
Tail <--Synonym--> Ass <--AtLocation-- Pain <--RelatedTo--> Nerve <--RelatedTo--> Sensor 
Intense <--SimilarTo--> Deep <--Antonym--> Light <--Synonym--> Easy <--RelatedTo--> Luck 