Pages 89-90 
    3.5.4.3 Creating coding variables/factors

Pages 103-104
    3.9.1 Selecting parts of a dataframe
    3.9.2 Selecting data with the subset() function

Pages 136-141
    4.5 Graphing relationships: the scatterplot
    4.5.1 Simple scatterplot
    4.5.2 Adding a funky line
    4.5.3 Grouped scatterplot

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