highvalyrian1-2  Exercise 2: Aspiration and Doubling
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"sky" vs "kite"
  The k in "kite" is aspirated (a puff of air); the k in "sky" is not.
  The High Valyrian k always matches "sky" (the same goes for p and t).

kkh
  A doubled kh: pronounced as one long sound. In the spelling only the
  first letter of a doubled digraph is doubled, because a real k followed
  by kh is impossible to say; so it is written kkh, not khkh.