rk/math.janet#L964">source</a></span> <pre class="binding-text">(permutations s &amp;opt k)

Returns permutations of length `k` from members of `s`</pre><a href="https://janetdocs.org/math/permutations">Community Examples</a></div><hr><div class="binding"><span id="math/poisson-distribution" class="binding-sym">math/poisson-distribution</span> <span class="binding-type">function</span> <span class="binding-type"><a href="https://github.com/janet-lang/spork/blob/87a2aae508a86d45363ae4cc747141847e463ee4//spor