21. What does the theme_minimal() function do in ggplot2?
22. In ggplot2, how do you customize the appearance of the legend title?
23. How do you customize the transparency of points in a ggplot2 scatter plot?
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?
26. In ggplot2, how do you create a bar plot with horizontal bars?
27. What is the purpose of the scale_y_log10() function in ggplot2?
28. How do you create a theme with a dark background in ggplot2?
29. In ggplot2, how do you customize the appearance of axis ticks?
30. How do you create a density plot in ggplot2 for a numeric variable named values?
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