navi1-9  Exercise 2: The Rule
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The rule: to add 1-7 to vol, drop the l of vol (except with 1) and lenite the
first sound of the unit.

  vosìng   vo- + tsìng, with ts lenited to s   (8 + 4 = 12)
  vopéy    vo- + pxey, with px lenited to p    (8 + 3 = 11)

For 20 (two eights and four):
  mevo- + sìng  ->  mevosìng   (built by the rule, not seen in a source)

Check the dictionary before using a number built this way in real writing.