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  1. or download this
            my $xor = $mt[$i-1]^($mt[$i-1]>>30);
            { use integer;  $mt[$i] = 1812433253 * $xor + $i; $mt[$i] >>= 
    +32 if $mt[$i] > 0xffffffff }
    
  2. or download this
        $mt[$i] >>= 32 if $mt[$i] > 0xffffffff;
    
  3. or download this
        $mt[$i] &= 0xffffffff;