Question: # Once you have created your `yr_region_df`, remove any rows from this dataframe # that contain data from any year before 1979 and/or have an

# Once you have created your `yr_region_df`, remove any rows from this dataframe # that contain data from any year before 1979 and/or have an NA value for one of # the eight regions. Your `yr_region_df` after this step should now have only 328 rows

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