In the lesson it mentions 'the irregular root prenn-' but I think it is in fact regular. The present 3rd person indicative plural is Ils prennent and that leads to prenn- as the subjunctive stem. Isn't it only irregular in the 1st and 2nd person plural where the prenn- becomes pren- as in prenions and preniez?
Maybe the irregularity stems from the fact that prendre/prenn- works differently from other -dre verbs such as rendre/rend- or attendre/attend-, etc.
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