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(Something similar is also known in principle to be true for general groups, though the hierarchy of axioms in this case is much more complicated.)
The same is true of ordinary and cyclic tag systems.
Much as in the previous section, even if paths do not converge for every possible string, it can still be true that paths converge for all strings that are actually generated from a particular initial string.
(In 3D, for example, this is true only for the tetrahedron.)
But in fact this is not true, and instead the system works a bit like a puzzle in which there is only one way to fit in each piece.
And more or less the same is true of descriptions based on ideas like natural selection in biology.
And by thinking in terms of simple programs we have thus been able in this section not only to understand why the Second Law is often true, but also to see some of its limitations.
But if in fact our universe is part of a multiway system, then this will not be true.
So what might make one think that this is true?
And the same is true if we pick up data of any kind that is encoded in a format we do not know.