Fascinating! But should it not be $b+$off in 

my @indices = sort {$off = 0;
       until (substr($string, $a+$off, $step) cmp substr($string, $b, 
+$step)){
                $off += $step;
       } } 0 .. length($string) - 1;

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In reply to Re^2: suffix array efficiency by hdb
in thread suffix array efficiency by RobertCraven

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