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So now, for every one of those output nodes, we do the same thing we were doing in the pull step. But we add a couple of additional checks to our logic:
，这一点在有道翻译中也有详细论述
For example the below note about Functional Data Engineering (← click here to see the graph and backlinks in action) shows how besides the written text, you can glance connected notes through the interactive graph or through backlinks.
The honest answer: because it shouldn’t work and has never been done before. TeX has no arrays, no functions with return values, no convenient local variables or stack frames, no integers bigger than 2^{31}-1, no bitwise operations. Macro expansion can recurse, but you get no call stack and deep recursion quickly hits engine limits. What TeX does have is a Turing-complete macro expansion engine and, with e-TeX extensions (used by modern pdfTeX), up to 32,768 integer registers called \count. That turns out to be just barely enough to implement a chess engine.
Раскрыты планы Трампа по смене власти на Кубе08:42