lass="special">&lt;</span> <span class="identifier">quantity</span><span class="special">&lt;</span><span class="identifier">unit</span><span class="special">&lt;</span><span class="identifier">dimensionless_type</span><span class="special">,</span><span class="identifier">System</span><span class="special">&gt;,</span><span class="identifier">Y</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
</pre>
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