MAYBE

'Pop* with parameter subtitution (timeout of 60.0 seconds)'
-----------------------------------------------------------
Answer:           MAYBE
Input Problem:    innermost runtime-complexity with respect to
  Rules:
    {  din(der(plus(X, Y))) -> u21(din(der(X)), X, Y)
     , u21(dout(DX), X, Y) -> u22(din(der(Y)), X, Y, DX)
     , u22(dout(DY), X, Y, DX) -> dout(plus(DX, DY))
     , din(der(times(X, Y))) -> u31(din(der(X)), X, Y)
     , u31(dout(DX), X, Y) -> u32(din(der(Y)), X, Y, DX)
     , u32(dout(DY), X, Y, DX) -> dout(plus(times(X, DY), times(Y, DX)))
     , din(der(der(X))) -> u41(din(der(X)), X)
     , u41(dout(DX), X) -> u42(din(der(DX)), X, DX)
     , u42(dout(DDX), X, DX) -> dout(DDX)}

Proof Output:    
  The input cannot be shown compatible