anchor.diff:          Students edit passages and receive personalized exercises based on their results. With over 100 expository passages, Proofreader gives students the practice they need to spot common grammatical errors.
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         <div>
  -        <a href="/play" class="q-button icon-button text-white">Try a Sample Activity <i class='fa fa-long-arrow-right'></i></a>
  +        <a href="/play" target="_blank" class="q-button icon-button text-white">Try a Sample Activity <i class='fa fa-long-arrow-right'></i></a>
         </div>
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positive.code:         Using the evidence-based strategy of sentence combining, students combine multiple ideas into a single sentence. They then receive instant feedback designed to help them improve their clarity and precision.
        </p>
        <div>
          <a href="/activity_sessions/anonymous?activity_id=445" class="q-button icon-button text-white">Try a Sample Activity <i class='fa fa-long-arrow-right'></i></a>
        </div>
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negative.code:         The diagnostic covers vital sentence construction skills and generates a personalized learning plan based on the student’s performance.
        </p>
        <div>
          <a href="/activity_sessions/anonymous?activity_id=413" target="_blank" class="q-button icon-button text-white">Try the Diagnostic <i class='fa fa-long-arrow-right'></i></a>
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