@Q:
RETURN COUNT_DISTINCT([ <span class="hljs-string">"yes"</span>, <span class="hljs-string">"no"</span>, <span class="hljs-string">"yes"</span>, <span class="hljs-string">"sauron"</span>, <span class="hljs-string">"no"</span>, <span class="hljs-string">"yes"</span> ])

@R
[
  <span class="hljs-number">3</span>
]