According to the author, this list is the 15-item list by Dolgopolsky (1964). It deviates, however, both in the concept labels which were used in the English translation from 1986 and in the literal translation of Dolgopolsky's list. It is therefore much more likely that Trask quoted Dolgopolsky's list intermediately from Shevoroshkin's list of 23 items. Since this list is again a rather specific translation of Dolgopolsky's list, it explains why Trask's list of Dolgopolsky and Dolgopolsky's list deviate in the item "louse" which Trask (following Shevoroshkin) translates as "louse/nit".
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