Abstract
If there is an even number of experimental conditions (Latin letters), it is possible to construct a Latin Square in which each condition is preceded by a different condition in every row (and in every column, if desired). These designs are useful in counterbalancing immediate sequential, or other order, effects. A simple, and easily remembered, procedure by which to construct such squares is described and illustrated. A proof is offered which shows that the procedure is valid for any size square having an even number of cells on a side.

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