MAYBE

Problem:
 sqr(0()) -> 0()
 sqr(s(x)) -> +(sqr(x),s(double(x)))
 double(0()) -> 0()
 double(s(x)) -> s(s(double(x)))
 +(x,0()) -> x
 +(x,s(y)) -> s(+(x,y))
 sqr(s(x)) -> s(+(sqr(x),double(x)))

Proof:
 DP Processor:
  DPs:
   sqr#(s(x)) -> double#(x)
   sqr#(s(x)) -> sqr#(x)
   sqr#(s(x)) -> +#(sqr(x),s(double(x)))
   double#(s(x)) -> double#(x)
   +#(x,s(y)) -> +#(x,y)
   sqr#(s(x)) -> +#(sqr(x),double(x))
  TRS:
   sqr(0()) -> 0()
   sqr(s(x)) -> +(sqr(x),s(double(x)))
   double(0()) -> 0()
   double(s(x)) -> s(s(double(x)))
   +(x,0()) -> x
   +(x,s(y)) -> s(+(x,y))
   sqr(s(x)) -> s(+(sqr(x),double(x)))
  Open