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RAR.  Note 19

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Relational Composition as Logical Matrix Multiplication (cont.)

With an eye to extracting a general formula, let us now examine
what we did in multiplying the 2-adic relations G and H together
to obtain their relational composite G o H.

Given the space X = {1, 2, 3, 4, 5, 6, 7}, whose cardinality |X| is 7,
we naturally observe 