# NOT RUN {
library(ggplot2)
ggplot(association, aes(x = x1, y = y1)) +
geom_point()
ggplot(association, aes(x = x2, y = y4)) +
geom_point()
ggplot(association, aes(x = x3, y = y7)) +
geom_point()
# }
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