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[lojban-beginners] Number questions

This appears in _Lojban for Beginners_:

   li ci su'i vo du li xo
   3 + 4 = ?

Fine, but I have some questions:

  - Why no "li" on "vo"? Is it optional or not?
  - Why "li" on "xo"? Optional or not? If optional,
    does meaning change?
  - If we can put "li" on "xo", can we put "le" on "ma"?
      do nelci le ma
    Optional or not? If optional, does meaning change?


Thanks for insights...


Hal