YES(?,PRIMREC)

We are left with following problem, upon which TcT provides the
certificate YES(?,PRIMREC).

Strict Trs:
  { a(b(x)) -> b(a(x))
  , a(c(x)) -> x }
Obligation:
  innermost runtime complexity
Answer:
  YES(?,PRIMREC)

The input was oriented with the instance of'multiset path order' as
induced by the precedence

 a > b, c > b, a ~ c .

Hurray, we answered YES(?,PRIMREC)