r - ggplot multiple panels, multiple curves -

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this code makea plot, scatter of 2 variables factored city , grade:

ggplot(e,aes(x=pre_c,y=post_c,col=grade))+geom_point()+facet_grid(grade~city)

my plot

can suggest how add second set of black dots in picture, scatter of pair of variables? first set control , second treated group in example.


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