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of theory. I will only say that in formulating that
rule, I considered that of the six fundamental permissible operations,
two are non-reversible, namely erasure and insertion. Where That is where there can either of
these can be performed the reverse operation cannot be performed. I further considered that three of the six fundamental permissible
operations complicate the graph, while the other
three simplify it. Namely, insertion, iteration,
and the placing of marking introduction of a double cut, complicate
the graph, while erasure, deiteration, and the
removal of a double cut simplify it. It is
necessary for the purpose to modify the
non-reversible operations so as to render
them reversible; and it fortunately happens

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