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<h2 class="hd hd-2 unit-title">W04intro: Week 4 Introduction</h2>
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<h3 class="hd hd-2">W04intro: Week 4 Introduction</h3>
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<h3 class="hd hd-4 downloads-heading sr" id="video-download-transcripts_W04intro">Downloads and transcripts</h3>
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<h4 class="hd hd-5">Transcripts</h4>
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