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  1. or download this
      DB<11> p sprintf("%.8f", $expected);
    1.98000000
    ...
      DB<12> p ($expected == $premium)
    
      DB<13>
    
  2. or download this
      DB<16> p ($expected - $premium)
    -2.22044604925031e-16
    
  3. or download this
      DB<13> $pa = 1.98
    
    ...
    
      DB<24> p ($pre - $exp)
    0