As I read more and begin to grasp the complexity of Marpa solution, and the 
desire to work all issues from within the context of grammar, actions (evemts, 
etc.) I can see why you guys want to insist on using rules and only rules, 
whether positive or negative, to parse the subject.  Let me please givee you a 
counter argument:
I am not a native English speaker.  When I learned the language, till today, 
when reading and parsing text, i may and do encounter words that I do not know. 
 Instead of going to the dictionary, I encapsulate such words and substitite 
them with either a context based approximation or with null and try to continue 
parsing.  Rarely, indeed very rarely, I cannot proceed.
What I would want is something similar, in which Marpa would tell me that it 
have encountered such an element and allow me to advise it to substitute it 
with something else or nullify it and continue.
I do not know how hard is that to implement, but I suspect that it should not 
be that hard.  And the practical benefits would be enormous
ZA

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