Nothing

```
circles <-
function(x0,y0,r,n=100, cols, ...){
theta <- seq(0, 2 * pi, length=n)
x=matrix(rep(x0, each=n), nrow=n)
y=matrix(rep(y0, each=n), nrow=n)
x <- x + r * cos(theta)
y <- y + r * sin(theta)
for(i in 1:length(x0)) polygon(x[,i], y[,i], col=cols[i], ...)
return(list(x,y))
}
```

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