YES
Did not drop rules.
Inlined conditions for 0 rules.
Left-inlined conditions for 0 rules.
Due to Ifrit-method removed 0 infeasible rules.
Did not use redundant rules method.
INFEASIBLE because

problem +(x,a()) ->* 0()
obtained from
root-nonreachability
requires
  [problem obtained from
  narrowing is proven infeasible
  using the symbol transition graph on
  s(+(x,a())) ->* 0()
  ,problem obtained from narrowing
  is proven infeasible
  using TCAP on
  a() ->* 0()
  ,problem obtained from narrowing
  is proven infeasible
  since unification failed for
  +(x,a()) ~ 0()]

where | is used as a fresh function symbol, since it is illegal in the input format.