ng&nbsp;<span class="keywordsign">-&gt;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(unit&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="constructor">Map</span>.key&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="constructor">Pretty</span>.doc)&nbsp;<span class="keywordsign">-&gt;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(unit&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>a&nbsp;<span c