code: public <B> StreamT<W,B> flatMapT(final Function<? super T, StreamT<W,B>> f) {
  
          return of(run.map(list -> list.flatMap(a -> f.apply(a).run.stream())
                                        .flatMap(a -> a)));
      }
docs: Flat Map the wrapped List
  <pre>
  {@code
  ListT.of(AnyM.fromStream(Arrays.asList(10))
  .flatMap(t->List.zero();
  
  
  //ListT<AnyM<Stream<List.zero>>>
  }
  </pre>
  @param f FlatMap function
  @return ListT that applies the flatMap function to the wrapped List