فَفِيهَا لُغَاتٌ، أَفْصَحُهَا ...
Translation: There are several usages; the most eloquent among them is ...
The author acknowledges variant treatments but selects one as the most eloquent and explains that treatment in the main text. This lesson teaches that preferred pattern.
We do not attribute a complete catalogue of the other readings to this short quotation, because the source’s main paragraph does not enumerate them.