@Q:
RETURN UNIQUE( [ <span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">2</span>,<span class="hljs-number">3</span>,<span class="hljs-number">3</span>,<span class="hljs-number">3</span>,<span class="hljs-number">4</span>,<span class="hljs-number">4</span>,<span class="hljs-number">4</span>,<span class="hljs-number">4</span>,<span class="hljs-number">5</span>,<span class="hljs-number">5</span>,<span class="hljs-number">5</span>,<span class="hljs-number">5</span>,<span class="hljs-number">5</span> ] )

@R
[
  [
    <span class="hljs-number">5</span>,
    <span class="hljs-number">4</span>,
    <span class="hljs-number">3</span>,
    <span class="hljs-number">2</span>,
    <span class="hljs-number">1</span>
  ]
]