sindarin_grammar1-4  Exercise 3: The Puzzle of i-Pheriannath
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The soft table says p -> b after the article i. But the attested form
i-Pheriannath has ph. So the text does not follow the neat table, and a
learner cannot assume the table predicts every attested form.

Why be cautious about any single chart: charts from different sources give
different outputs for the same letter, disagree on the number of mutations,
and name them differently. Tolkien's texts are the anchor; the charts are
scholars' proposals.