For his tenth birthday, Mona wants to buy her son Jason some stamps for his collection. At the hobby shop she finds six different packages (which we shall call u, v, w, x, y, z). The kinds of stamps in each of these packages are shown in Table 15.22.
Determine all minimal combinations of packages Mona can buy so that Jason will get some stamps from all four geographical locations.

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United States European Asian African V/