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  1. or download this
        $mid = int( ( $lo + $hi ) / 2 );
    if ( $hi == $lo ) { return $mid }
  2. or download this
        return $hi
        if  $hi == $lo;
    $mid = int( ( $lo + $hi ) / 2 );
  3. or download this
        if ( $suff[ $indices[ $index ] ] =~ /^$pattern/ ) {
        push @positions, $indices[ $index ] + 1;
...
    else {
        last;
    }
  4. or download this
        last
        if  $suff[ $indices[ $index ] ] !~ /^$pattern/;
    push @positions, $indices[ $index ] + 1;