YES(?,ELEMENTARY)

'epo* (timeout of 60.0 seconds)'
--------------------------------
Answer:           YES(?,ELEMENTARY)
Input Problem:    innermost runtime-complexity with respect to
  Rules:
    {  and(tt(), X) -> activate(X)
     , plus(N, 0()) -> N
     , plus(N, s(M)) -> s(plus(N, M))
     , activate(X) -> X}

Proof Output:    
  Strict Rules in Predicative Notation:
   {  and(; tt(), X) -> activate(; X)
    , plus(N, 0();) -> N
    , plus(N, s(; M);) -> s(; plus(N, M;))
    , activate(; X) -> X}
  Safe Mapping:
   safe(and) = {1, 2}, safe(tt) = {}, safe(activate) = {1},
   safe(plus) = {}, safe(0) = {}, safe(s) = {1}
  Argument Permutation:
   mu(and) = [2, 1], mu(activate) = [1], mu(plus) = [2, 1]
  Precedence:
   plus ~ plus, plus ~ activate, activate ~ plus, activate ~ activate,
   and > plus, and > activate, and ~ and