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) The oxygen travels to the lungs through the windpipe (2) The air sacs in the lungs send the oxygen into the blood stream (3) The carbon dioxide in the blood stream is transferred to the air sacs (4) The lungs expel through the nose or mouth back into the environment.  
Where does the following step fit into the given list of steps: You breathe oxygen into your body through the nose or mouth 
[A]:  Before step 1. 


[Q]: Steps: (1) A mine is excavated in the side of a mountain (2) Miners enter the mine (3) Miners remove the coal from the mine (4) The coal is placed into carts or on a conveyor belt (5) The coal is moved up to the surface (6) The coal is loaded onto a truck  
Where does the following step fit into the given list of steps: The truck takes the coal to a power station. 
[A]:  After step 6. 


[Q]: Steps: (1) Animals and plants die in soft soil or mud (2) Sediment builds up over the remains (3) The remains decompose, leaving only trace amounts (4) A fossil is formed  
Where does the following step fit into the given list of steps: The remaining parts over the years are replaced with mineral 
[A]:
 After step 3.