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Method 6: 14 wallclock secs (14.31 usr +  0.01 sys = 14.32 CPU)
Method 7: 15 wallclock secs (14.28 usr +  0.01 sys = 14.29 CPU)
Method 8: 14 wallclock secs (14.25 usr +  0.01 sys = 14.26 CPU)

Method 6: 14 wallclock secs (14.08 usr +  0.02 sys = 14.10 CPU)
Method 7: 14 wallclock secs (14.14 usr +  0.01 sys = 14.15 CPU)
Method 8: 15 wallclock secs (14.12 usr +  0.01 sys = 14.13 CPU)

sub fact6b{
  my ($m, $n) = @_; 
...
    return Math::BigInt->new($m);
  }
}