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<h2>Navigation</h2>
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<tr><td>Basic level content</td><td><a href="start1.htm">Start</a></td><td><a href="1a1.htm">Digit span measures of STM</a></td><td><a href="2a1.htm">Recency measures of STM</a></td><td><a href="test1.htm">Test your learning</a></td></tr>
<tr><td>Intermediate level content</td><td></td><td><a href="1b1.htm">Research using digit span measures</a></td><td><a href="2b1.htm">Research using recency measures</a></td><td></td></tr>
<tr><td>Advanced level content</td><td></td><td><a href="1c1.htm">Ecological validity and STM research</a></td><td><a href="2c1.htm">Sampling validity and STM research</a></td><td></td></tr>
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