you are likely to find Envelope in/at/on Mail. you are likely to find People in/at/on Mail. People have Person. Person does not want (to) Nervous. 
Rat is a type of Hire. Rat is a synonym of Finger. Finger can be used for Poke. 
Envelope --AtLocation--> Mail <--AtLocation-- People --HasA--> Person --NotDesires--> Nervous 
Hire <--IsA-- Rat <--Synonym--> Finger --UsedFor--> Poke 