Detailed Instructions: Given a list of steps and an additional step, determine where the step fits into the original list of steps. A correct answer, correctly places the given step into the set of steps so that it creates a new plausible set of steps. Output must be formatted as 'After step n', where n is the step number after which the given additional step is to be inserted.
Q: Steps: (1) Plants and animals long ago died (2) They are buried under layers of soil (3) Pressure builds over time (4) The remains liquefy  
Where does the following step fit into the given list of steps: The carbon atoms rearrange to become a new substance. 
A:
 After step 4. 