MAYBE

'epo* (timeout of 60.0 seconds)'
--------------------------------
Answer:           MAYBE
Input Problem:    innermost runtime-complexity with respect to
  Rules:
    {  purge(nil()) -> nil()
     , purge(.(x, y)) -> .(x, purge(remove(x, y)))
     , remove(x, nil()) -> nil()
     , remove(x, .(y, z)) ->
       if(=(x, y), remove(x, z), .(y, remove(x, z)))}

Proof Output:    
  The input cannot be shown compatible