@SafeVarargs
    @SuppressWarnings({ "unchecked" })
    static <T> Seq<T> concat(Iterable<? extends T>... iterables) {
        return concat(SeqUtils.seqs(iterables));
    }
Concatenate a number of streams.
<p>
<pre><code>
// (1, 2, 3, 4, 5, 6)
Seq.of(1, 2, 3).concat(Seq.of(4, 5, 6))
</code></pre>
jOOL/src/main/java/org/jooq/lambda/Seq.java