MAYBE
* Step 1: Failure MAYBE
  + Considered Problem:
      - Strict TRS:
          add(0(),X) -> X
          add(s(X),Y) -> s(add(X,Y))
          dbl(0()) -> 0()
          dbl(s(X)) -> s(s(dbl(X)))
          first(0(),X) -> nil()
          first(s(X),cons(Y)) -> cons(Y)
          half(0()) -> 0()
          half(dbl(X)) -> X
          half(s(0())) -> 0()
          half(s(s(X))) -> s(half(X))
          sqr(0()) -> 0()
          sqr(s(X)) -> s(add(sqr(X),dbl(X)))
          terms(N) -> cons(recip(sqr(N)))
      - Signature:
          {add/2,dbl/1,first/2,half/1,sqr/1,terms/1} / {0/0,cons/1,nil/0,recip/1,s/1}
      - Obligation:
          innermost runtime complexity wrt. defined symbols {add,dbl,first,half,sqr,terms} and constructors {0,cons
          ,nil,recip,s}
  + Applied Processor:
      NaturalPI {shape = Mixed 3, restrict = NoRestrict, uargs = UArgs, urules = URules, selector = Nothing}
  + Details:
      Incompatible
MAYBE