s="emphasis"><em><span class="bold"><strong>map
                  intersection</strong></span></em></span> function similar to <span class="emphasis"><em>set
                  intersection</em></span>. If, on intersection, an element value
                  pair <code class="computeroutput"><span class="special">(</span><span class="identifier">k</span><span class="special">,</span><span class="identifier">v</span><span class="special">)</span></code> it's key <code class="computeroutput"><span class="ident