This is a quasi-complete Latin square.

A B C D E
E C A B D
C D B E A
D A E C B
B E D A C

It is a Latin square because every letter appears once in each row and once in each column.

It is quasi-complete because every letter is a horizontal neighbour to every other letter exactly twice, and every letter is a vertical neighbour to every other letter exactly twice.

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Last updated 2/4/00