YES

Proof:
This system is quasi-decreasing.
By \cite{O02}, p. 214, Proposition 7.2.50.
This system is of type 3 or smaller.
This system is deterministic.
System R transformed to U(R).
Call external tool:
ttt2 - trs 30
Input:
  a -> b
  ?1(b, x) -> A
  f(x) -> ?1(x, x)
  g(x, x) -> h(x)
  h(x) -> i(x)

 DP Processor:
  DPs:
   f#(x) -> ?1#(x,x)
   g#(x,x) -> h#(x)
  TRS:
   a() -> b()
   ?1(b(),x) -> A()
   f(x) -> ?1(x,x)
   g(x,x) -> h(x)
   h(x) -> i(x)
  TDG Processor:
   DPs:
    f#(x) -> ?1#(x,x)
    g#(x,x) -> h#(x)
   TRS:
    a() -> b()
    ?1(b(),x) -> A()
    f(x) -> ?1(x,x)
    g(x,x) -> h(x)
    h(x) -> i(x)
   graph:
    
   Qed