navi1-3  Exercise 1: Number and Pointing Prefixes
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From tute "person":

  (a) two people      mesute        me+ + tute; t -> s
  (b) three people    pxesute       pxe+ + tute; t -> s
  (c) people          aysute        ay+ + tute; t -> s  (the short plural "sute" is also possible)
  (d) this person     fìtute        fì- + tute; fì- causes NO lenition, so nothing changes
  (e) these people    faysute       fay+ + tute; fay+ causes lenition, t -> s

From po "s/he":

  "they"   ayfo       ay+ + po; p -> f
           fo         short plural, prefix dropped

Summary of changes: t -> s in (a), (b), (c) and (e); p -> f in "they"; no
change after fì-.