Comments on 4×4 Philatelic Latin Squares
Postage stamps are occasionally issued in sheets of n stamps, printed in an n × n array and containing n of each of the n stamps. Sometimes, the n × n array forms a philatelic Latin square (PLS): Each of the n stamps appears exactly once in each row and exactly once in each column. Figure 1 shows such a sheet (with selvage) with n = 4.
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