slim <- function(x,y){
if(any(sapply(x,is.factor))) x[] = lapply(x, as.character)
if(any(sapply(y,is.factor))) y[] = lapply(y, as.character)
x = x[do.call(order, x),]
y = y[do.call(order, y),]
result = x[!duplicated(rbind(y, x))[nrow(y) + 1:nrow(x)], ]
return(result)
}
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