faults to `:two-side`,
with `:greater` and `:lesser` being the other two options.
The last optional argument is `k` number of values
in permutation distribution</pre><a href="https://janetdocs.org/math/permutation-test">Community Examples</a></div><hr><div class="binding"><span id="math/permutations" class="binding-sym">math/permutations</span> <span class="binding-type">function</span> <span class="binding-type"><a href="https://github.com/janet-lang/spork/blob/87a2aae508a86d45363ae4cc747141847e463ee4//spo