[lojban-beginners] A few questions about chapters 18 and 19

[turnip <turnip@bcpl.net>]

FINALLY finished the Lojban Reference Grammar!  (Yes, there was a long hiatus 
there).  Anyway, a few questions.  In Chapter 18:
 8.13)    ro ratcu ka'e citka da'a ratcu
    all rats can eat all-but-one rats.
    All rats can eat all other rats.
Does this imply that each rat can eat EVERY RAT but one?  That's a lot of rats 
for one rat to eat.  Or is it ambiguous if it means some subset of all-but-one 
rats?  How would one disambiguate the two cases, if the ambiguity is there as 
written?

  In Chapter 19, with "si":  Can I assume that a cmavo cluster requires a "si" 
for each of the component cmavo to completely erase, like: najenai si si si ?

9.5)  la tcarlis. cusku lo'u le ninmu cu morsi le'u
        .iku'i ri jmive
    Charlie says [quote] le ninmu cu morsi [unquote].
        However, the-last-mentioned is-alive.
    Charlie says ``le ninmu cu morsi'', but he is alive.

  Why doesn't "ri" refer back to "lo'u le ninmu cu morsi le'u", i.e. asserting 
that the utterance is alive?  Isn't that the most recent sumti?

                    --gejyspa