[R] how to add notes to the graph?

[rlearner309]

Hi,  
I have a simple graph:
x <- c(1,2,3)
plot(x, pch=16,type="b")

I would like to add some notes just beside these 3 dots, and the notes are
stored in a vector:

a <- c(12,54,84)  

So the result will be: there should be a "12" below the first dot (or next
to it, but not replacing the solid dot), a "54" next to the second dot...

what if a is not numeric? a <- c("a","b","c")

Thank you very much!!
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