This is rehashing the "QUILISMA. do not hold" discussion. Cardine: "The notes which precede the quilisma are almost always written with long signs" (Gregorian Semiology, p. 200). Almost always, he says. A normal clivis is possibly one of the exceptions he had in mind.The second note has to be long because it precedes the quilisma in the middle of a neum. The note before a quilisma is always long in Gregorian chant, even if not explicitly notated as such.
The note before a quilisma is always long (whenever it is part of the same syllable), even if it is not always notated as such. The points made in that discussion prove the fact. The absence of an episema on a clivis does not mean the clivis is always short-short. It could be scribal laziness, oversight, meant to be taken for granted, or diligent copying from another manuscript that itself had the same problem.Almost always, he says.
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