static <T1, T2, T3> Seq<Tuple3<T1, T2, T3>> outerApply(Iterable<? extends T1> iterable, Function<? super T1, ? extends Iterable<? extends T2>> function2, Function<? super T2, ? extends Iterable<? extends T3>> function3) {
        return outerApply(seq(iterable), t -> seq(function2.apply(t)), t -> seq(function3.apply(t)));
    }
Outer apply 3 functions to a stream.
<p>
<pre><code>
// (tuple(0, null), tuple(1, 0), tuple(2, 0), tuple(2, 1))
Seq.of(0, 1, 2).outerApply(t -> Seq.range(0, t))
</code></pre>
jOOL-java-8/src/main/java/org/jooq/lambda/Seq.java