A Latin square is an n × n table filled with n different symbols in such a way that each symbol occurs exactly once in each row and exactly once in each column.
These occur as the multiplication tables of a quasigroup.
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... housing units at an average density of 177.0/km² (458.2/mi²). The racial makeup of the town is 89.82% White, 1.47% African American, 0.20% Native American, ...