YES(?,ELEMENTARY)

'epo* (timeout of 60.0 seconds)'
--------------------------------
Answer:           YES(?,ELEMENTARY)
Input Problem:    innermost runtime-complexity with respect to
  Rules:
    {  app(nil(), YS) -> YS
     , app(cons(X), YS) -> cons(X)
     , from(X) -> cons(X)
     , zWadr(nil(), YS) -> nil()
     , zWadr(XS, nil()) -> nil()
     , zWadr(cons(X), cons(Y)) -> cons(app(Y, cons(X)))
     , prefix(L) -> cons(nil())}

Proof Output:    
  Strict Rules in Predicative Notation:
   {  app(; nil(), YS) -> YS
    , app(; cons(; X), YS) -> cons(; X)
    , from(X;) -> cons(; X)
    , zWadr(YS; nil()) -> nil()
    , zWadr(nil(); XS) -> nil()
    , zWadr(cons(; Y); cons(; X)) -> cons(; app(; Y, cons(; X)))
    , prefix(; L) -> cons(; nil())}
  Safe Mapping:
   safe(app) = {1, 2}, safe(nil) = {}, safe(cons) = {1},
   safe(from) = {}, safe(zWadr) = {1}, safe(prefix) = {1}
  Argument Permutation:
   mu(app) = [2, 1], mu(from) = [1], mu(zWadr) = [1, 2],
   mu(prefix) = [1]
  Precedence:
   prefix ~ prefix, prefix > from, zWadr > prefix, zWadr ~ zWadr,
   zWadr > from, zWadr > app, from ~ from, app > prefix, app > from,
   app ~ app