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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... $69,519, and the median income for a family is $69,615. Males have a median income of $46,083 versus $34,261 for females. The per capita income for the village is $25,682. ...