Pastable version of Enumerable#cluster

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            <pre class="sunburst"><span style="color:#E28964;">module</span> <span style="text-decoration:underline;">Enumerable</span>
    <span style="color:#E28964;">def</span> <span style="color:#89BDFF;">cluster</span> 
        sort.<span style="color:#89BDFF;">inject</span>([[]]) <span style="color:#E28964;">do </span>|<span style="color:#3E87E3;">out</span>, <span style="color:#3E87E3;">n</span>|
            <span style="color:#E28964;">if</span> out.<span style="color:#89BDFF;">last</span>.<span style="color:#89BDFF;">include?</span>(n) <span style="color:#E28964;">or</span> out.<span style="color:#89BDFF;">last</span>.<span style="color:#89BDFF;">empty?</span>
                out.<span style="color:#89BDFF;">last</span> <span style="color:#E28964;">&lt;&lt;</span> n
            <span style="color:#E28964;">else</span>    
                out <span style="color:#E28964;">&lt;&lt;</span> [n]
            <span style="color:#E28964;">end</span>     
            out     
        <span style="color:#E28964;">end</span>     
    <span style="color:#E28964;">end</span>
<span style="color:#E28964;">end</span>
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