class X {
  Validation<Throwable, Unit> a;
  Validation<Throwable, Unit> b;
  Validation<Throwable, Unit> c;
  Validation<Throwable, Unit> d;
  Validation<Throwable, Unit> e;
  Validation<Throwable, Unit> f;
  ////
  Validation<Throwable, Unit> g;
  Validation<Throwable, Unit> h;
  Validation<Throwable, Unit> i;
 
  Validation<Throwable, Unit> tt1() {
    return a.sequence(b).
            sequence(c).
            sequence(d).
            sequence(e).
            sequence(f);
  }
 
  Option<NonEmptyList<Throwable>> t2() {
    return tt1().nel().accumulate(Semigroup.<Throwable>nonEmptyListSemigroup(),
            g.nel(),
            h.nel(),
            i.nel());
  }
}