Abstract
If tests with variable responses are used in a key, reticulation may reduce the length of the printed key. The saving in printing the yeast key [using the computer program GENKEY] was only 3.5%. However, this key was constructed and stored on a computer file for later printing before it was possible to influence the choice of tests to encourage reticulation; thus further savings might be possible. The computing time required to detect reticulation was about 25% of the total time taken to read the key back from the computer file, reticulate and print it. This was only 2% of the time taken to construct the key.

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