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<p><a href="page.php?w=non-deterministic_Turing_machine">non-deterministic Turing machine</a>s, <a href="page.php?w=quantum_Turing_machine">quantum Turing machine</a>s, <a href="page.php?w=symmetric_Turing_machine">symmetric Turing machine</a>s and <a href="page.php?w=alternating_Turing_machine">alternating Turing machine</a>s. They are all equally powerful in principle, but when resources (such as time or space) are bounded, some of these may be more powerful than others.</p>

<p>A deterministic Turing machine is the most basic Turing machine,</p><p>
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