Next You can't get there from here 9

Trading

          for my $cargo (all_selections($items)) {
        Number of items             Number of cargoes
          1                                  1
          2                                  3
          3                                  7
          4                                 15
         10                              1,023
         15                             32,767
         20                          1,048,575
         30                      1,073,741,823

continued...
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