21.
What does the theme_minimal() function do in ggplot2?

22.
In ggplot2, how do you customize the appearance of the legend title?

24.
In ggplot2, what does the geom_text() function do?

25.
How do you create a faceted scatter plot in ggplot2 for two categorical variables facet1 and facet2?

27.
What is the purpose of the scale_y_log10() function in ggplot2?

29.
In ggplot2, how do you customize the appearance of axis ticks?

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