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Below you will find example usage of this term as found in modern and/or classical literature:

1. Of the Origin and Progress of Language by James Burnett Monboddo (1809)
"The whole Creek language derived, from Jive combinations of vowels in duads. f C. 15. A NOTHER division of words considered ..."

2. Ante-Nicene Christian Library: Translations of the Writings of the Fathers by James Donaldson, Alexander Roberts, Allan Menzies, Novatianus (1868)
"... Theory of Emanation by duads. Of some such nature, as I who have accurately examined their systems [have attempted] to state compendiously, ..."

3. Mathematical Questions and Solutions by W. J. C. Miller (1871)
"It is required, with nine numbers each taken three times, to form nine triads containing twenty-seven distinct duads (or, what is the same tiling, ..."

4. The Cambridge and Dublin Mathematical Journal by William Whewell, Duncan Farquharson Gregory, Robert Leslie Ellis, William Thomson Kelvin, Norman Macleod Ferrers (1852)
"Write n duads containing all the symbols to begin with, and for the cycle take one term in succession from each of the duads to the wth, and then take a ..."

5. The Cambridge and Dublin Mathematical Journal (1852)
"Write M duads containing all the symbols to begin with, and for the cycle take one term in succession from each of the duads to the «th, and then take a ..."

6. The Collected Mathematical Papers of Arthur Cayley by Arthur Cayley (1896)
"TAKE for instance 6 letters ; a partition into 3's, such as abc . def contains the 6 duads ab, ac, be, de, df, ef. A partition into 2's such as ab.cd.ef ..."

7. Memoirs and Proceedings (1855)
"Im, ma, which meet A, must be found each at some second summit of P, these n — 1 duads will appear in the n — 3 triplets which represent the remaining ..."