Some of the fundamental ideas about combinatorial geometry are presented. We start with the study of some affine, finite planes, to then come to that of the Graeco-Latin squares. Some very interesting problems are here emphasized, like Euler's one of the 36 officers or, in more recent times, Kirkman's one (19th century) of the 15 schoolgirls. We end the paper with the analysis of some aspect of cryptography.
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