| 21. | To ensure predictability, all aperiodic messages must be included in the bandwidth management calculations.
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| 22. | Penrose had discovered two simple sets of aperiodic tiles, each consisting of just two quadrilaterals.
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| 23. | He calls this an aperiodic crystal.
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| 24. | A finite-state automaton is counter-free if and only if it is aperiodic.
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| 25. | An "'aperiodic sequence "'is one which is not ultimately periodic.
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| 26. | The best-known examples of an aperiodic set of tiles are the various Penrose tiles.
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| 27. | The known aperiodic sets of prototiles are seen on the list of aperiodic sets of tiles.
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| 28. | The known aperiodic sets of prototiles are seen on the list of aperiodic sets of tiles.
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| 29. | In 1988, Peter Schmitt discovered a single aperiodic prototile in 3-dimensional Euclidean space.
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| 30. | They belong to a general class of aperiodic tilings, which use tiles that cannot tessellate periodically.
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