Brown & Peterson studied how well people can remember groups of three letters (e.g., BJK, YPX) after various delays. They found that even after 18 seconds subjects could still remember most of the material.

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Brown & Peterson found that memory for trigrams (groups of three letters) deteriorated significantly over delays, with subjects remembering very little after 18 seconds, primarily due to interference.

Brown & Peterson Studied How Well People Can Remember Groups