Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
Still more pedantic are the practices of making the fourth letter of quidquid a c to avoid the appearance of repeating a question, and of writing
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quotidie instead of colidie to show that it stands for quot diebus. But such practices have disappeared into the limbo of absurdities.