Nothing
u <- c(first = 1, second = 2, third = 3)
u # names are displayed in output
names(u) # show just the names
u["second"] # access by name
names(u) <- c("one", "two", "three") # change the names
names(u)[2] <- "TWO" # change just one name
u
u["first"] # old names gone now
setNames(u, c("a", "b", "c")) # new object is named
u # u remains unchanged
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