Where is "bi'u" in the book?

[xod <xod@bway.net>]

I was browsing the ma'oste and I came across a cmavo "bi'u":

bi'u [ UI3a ] new information 
       discursive: newly introduced information - previously introduced
information (cf. nindatni, saurdatni)


I searched in the Book for mention of it, and I didn't find it. Did I miss
it? Was it thrown in later, or since removed?


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