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.

Steps: (1) A star burns in space (2) Eventually it burns all its hydrogen (3) Becomes a red giant (4) Once the red giant burns itself out (5) The core of the star collapses (6) The gasses will start to disperse (7) A white dwarf has been formed.  
Where does the following step fit into the given list of steps: Only the core is left 
 After step 6. 

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 
 Before step 1. 

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 

 Before step 1.