Nothing
duplicatedxy <- function(x,y) {
if(is.list(x)) {
if(all(!is.na(match(c('x','y'),names(x))))) {
return(duplicated(as.data.frame(x)))
}
stop("Argument \"x\" is a list but lacks x and/or y components.\n")
}
duplicated(data.frame(x=x,y=y))
}
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