&quot; &quot;which&quot;   
#&gt; 
#&gt; $`40000001:50000000`
#&gt; integer(0)
#&gt; attr(,&quot;maxindex&quot;)
#&gt; [1] 100000000
#&gt; attr(,&quot;class&quot;)
#&gt; [1] &quot;booltype&quot; &quot;which&quot;   
#&gt; 
#&gt; $`50000001:60000000`
#&gt; integer(0)
#&gt; attr(,&quot;maxindex&quot;)
#&gt; [1] 100000000
#&gt; attr(,&quot;class&quot;)
#&gt; [1] &quot;booltype&quot; &quot;which&quot;   
#&gt; 
#&gt; $`60000001:70000000`
#&gt; integer(0)
#&gt; attr(,&quot;maxindex&quot;)
#&gt; [1] 100000000
#&g