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diff --git a/instructor/CONTRIBUTORS.html b/instructor/CONTRIBUTORS.html
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 <p>Tip: use <code>.head()</code> method throughout this lesson to keep
 your display neater for students. Encourage students to try with and
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 <p>The method <code>.count()</code> gives you the number of non-NaN
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 <p>If learners have trouble generating the output, or anything happens
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