Free Steam Game Code - Daily Riddle #45

welcome to the daily riddle 45#!
We want to combine steemit.com and steam.com, so you can win one steam game everyday.
Solve the riddle and grab the random steam game code.

Rules:

The (x) are letters which must be solved in the following riddle
The (0) is a number betwen 0 and 9.
Vote and resteem that we can continue the riddles

My first is in adopter but not in trapdoor
My second is in experimenter but not in preeminent
My third is in aberrational but not in interrelation
My fourth is in socialization but not in iconoclastic

yours @dailysteamcodes