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There is a 5-state, 2-sumbolsymbol Turing machine for which it is not known whether it halts. See http://en.wikipedia.org/wiki/Busy_beaver.
There is a 5-state, 2-sumbol Turing machine for which it is not known whether it halts. See http://en.wikipedia.org/wiki/Busy_beaver.
There is a 5-state, 2-symbol Turing machine for which it is not known whether it halts. See http://en.wikipedia.org/wiki/Busy_beaver.
