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Rest assured, there is no insider joke to be had. And, there is no precise translation. No English-GC! dictionary to consult. No Rosetta Stone⢠software by which to practice.
It's like very higher order math that leaves you drowning in Greek symbols. No one really understands that stuff; it just becomes comfortably familiar (J. vonNewmann - I think).
So you read, and puzzle, and read, and puzzle some more, and then, gradually, it all begins to make a perfect sense. It is internally coherent; which is a great deal more than some can say about what they write here. And, it is coherent over time. What was written two weeks ago is consistent with what will be written tomorrow.
It's up to individual readers how much effort they care to sink into understanding. GC! leaves it all up to the individual. He's neither offended nor pleased, either way. But, know that many of us are quite happy we made the effort, and are grateful for his presence.