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This PR addresses the suggestions for "Exploring Data Frames" in #22 by wrapping commands in
head()
as needed. It explains the reason for this in the first instance where it occurs.This PR also removes a challenge that asks learners to create a script and to put it under version control. These are both concepts that learners would be exposed already if taking this lesson as part of a standard SWC workshop, but aren't appropriate in the context of the workflow for this workshop.