tolkienlanguages1-6  Exercise 2: Soft Mutation
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From the table (radical -> soft):
  t -> d
  p -> b
  c -> g
  d -> dh

gwath ("shadow") after i (the): the soft mutation of g is a dropped
consonant (written '), so gwath -> i 'wath, "the shadow".

(The table is from one source; other scholars propose a longer one.)