x1 of mrilu is the sender of the mail, I think. x2 is the mail
itself. I don't know what x3 and x4 are. I think x3 is the
recipient, but then I don't know what x4 is. I also don't know if
x1 and x3 can be stations in the mail network.
-Robin
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Reason #237 To Learn Lojban: "Homonyms: Their Grate!"