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2001, Stephen T. Ross, The Inland Fishes of Mississippi, page 33:
The dichotomous keys are constructed so that each couplet presents a set of alternative choices.
2004, Shin'ichiro Ishikawa, An Exploration of a New Poetic Expression Beyond Dichotomy:
As long as the correct statement of each couplet is chosen, and the unknown organism is included in the key, a confident identification is usually achieved.