    470 1.562e-11 ***</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> ---</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1</span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># test contrasts</span></span></span>
<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/stats/contrasts.html" class="external-link">contrasts</a></span><span class="op">(</span><span class="v